title_body: What changes need to be made to espresso machine so it can function properly in space?
upvoted_answer: I was able to dig up this press release:
  http://www.lavazza.com/en/.content/document/pdf/PR_Italian-espresso-in-orbit.pdf
  
  The first capsule-based espresso system able to work in the extreme
  conditions of space is here. It is called ISSpresso and is the
  brainchild of two Italian companies — Argotec and Lavazza — in
  collaboration with the Italian Space Agency
  Turin, 13 June 2014 – “An espresso coffee is what I miss most aboard
  the International Space Station.” We have repeatedly heard this
  comment from the Italian astronauts who for 13 years have been at
  times working in the International Space Station, and today their
  espresso wish is about to become reality. In fact, Argotec and Lavazza
  are working together with the Italian Space Agency (ISA) to actually
  bring the authentic Italian espresso onto the International Space
  Station. So in the Futura Mission — the second long-term mission of
  the Italian Space Agency aboard the Space Station — another Italian
  astronaut of the European Space Agency, Air Force Captain Samantha
  Cristoforetti, could not only be the first Italian woman to go into
  space, but also the first astronaut in history to drink an authentic
  Italian espresso in orbit.
  Its name is ISSpresso. It takes its name from the International Space
  Station (ISS), where it is to be installed. It is the first
  capsule-based espresso system able to work in the extreme conditions
  of space, where the principles that regulate the fluid dynamics of
  liquids and mixtures are very different from those typical on Earth.
  ISSpresso is the product of a project run by Argotec, the Italian
  engineering company specialised in the design of aerospace systems and
  European leader in the preparation of healthy and nutritious foods for
  in-space consumption, and Lavazza, the historic Italian coffee brand.
  ISSpresso is a veritable technological and engineering jewel, able to
  deliver a perfect espresso in weightless environment. This is why it
  was selected by the Italian Space Agency to be used aboard the ISS, in
  the framework of the Request for Expression of Interest that the
  Agency keeps constantly open to public-private partnership projects
  and activities to be carried out in the ISS.
  “Italian coffee is a beverage without borders — comments Giuseppe Lavazza, Vice President
  of Lavazza — and we have been thinking about taking the espresso into
  space for some time. Indeed, as far back as ten years ago we launched
  the espresso into orbit artistically with the photographs taken by
  Thierry Le Gouès and our Mission to Espresso calendar, which at the
  time may have looked like a work of science fiction but was actually
  just a vision of the future. In fact, today we are in a position to
  overcome the limits of weightlessness and enjoy a good espresso — the
  indisputable symbol of made in Italy products — on board the
  International Space Station. We are proud to have worked on this major
  project with Argotec, through the Lavazza Innovation Center, our
  division dedicated to research and product innovation: a scientific
  and engineering challenge which we hope will improve the living and
  nutrition quality of astronauts engaged on long missions.”
  “Our aerospace engineers — stated David Avino, Managing Director of Argotec
  — have designed a new-concept coffeemaker, which is safe for the
  astronauts and able to function in microgravity conditions, also
  thanks to Lavazza’s experience as a leader in capsule extraction 2
  systems. The functional project was already completed in June 2013:
  Argotec had been working on it for about one year. This is an ultra
  high-tech project which has led to innovative solutions, applicable
  with immediate returns on Earth as well. ISSpresso is a technological
  challenge that meets very stringent requirements, imposed by the
  Italian Space Agency, in terms of technical functionality and safety.
  In addition to the engineering aspect, Argotec is also taking care of
  the European astronauts’ training and nutrition. Food provides an
  important psychological support and being able to enjoy a good Italian
  espresso may be just the right way to finish off the menu designed
  especially for each astronaut, helping him or her to feel closer to
  home.”
  Roberto Battiston, President of the Italian Space Agency added:
  “ISSpresso is a perfect example of the way ISA's decision to make ISS
  national usage rights available to public-private partnership
  initiatives can result in a valorisation of public resources for
  technological, economic, and social objectives. The ISA will bring
  ISSpresso aboard the ISS, thanks to bilateral cooperation agreements
  with the NASA, as it shares with the project partners the objective of
  improving the quality of life of ISS astronauts, as well as the
  astronauts who will take part in future long interplanetary
  exploration missions. At the same time, we are also proud to
  contribute to the promotion of the image and spreading of the
  Made-in-Italy brand at international or better “space”, level.”
  A coffee break in space. A prototype of the space coffee machine is
  currently being tested at Argotec’s laboratories and all the necessary
  functional and safety checks. In a subsequent phase, Finmeccanica –
  Selex ES will participate in the assessment activities aimed at
  launching ISSpresso into orbit with the Futura Mission crew, one of
  whom is the Italian astronaut Samantha Cristoforetti. The ‘corner
  café’ on the ISS will be the hub for socialising on board the Station,
  a sort of social network in space, a venue for getting together,
  chatting and relaxing: an aspect that should not be ignored in
  missions that keep the astronauts away from home for many months in a
  very challenging environment. The innovative capsule system will also
  be able to prepare not only a regular espresso, but also a caffè lungo
  or hot beverages, such as tea, infusions and broth, so that food can
  also be rehydrated.
  Extra-terrestrial technology. Every tiniest detail
  of ISSpresso is designed to respond to a scientific and engineering
  challenge: in fact, the machine studies have enabled principles of
  physics and fluid dynamics to be tackled, such as the difficulty of
  handling liquids at high pressure and high temperature in a space
  environment. Just think that the plastic tube carrying the water
  inside a normal espresso machine has been replaced with a special
  steel tube designed to withstand pressure of more than 400 bar. The
  machine is so complex that it weighs about 20 kilograms since there
  are back-ups of all the critical components for safety reasons in
  accordance with the specifications agreed upon with the Italian Space
  Agency. ISSpresso represents a technologically high-value project
  which, besides increasing the variety of flavour in the astronauts’
  menu, will help improve our understanding of the principles of fluid
  dynamics and conditions in microgravity. Some of the solutions adopted
  have led to international patents, which will be useful both for
  future space missions and immediate terrestrial use...
  
  tl;dr
  It looks like its a heavy duty capsule system designed to withstand high pressure that not only makes coffee, but makes tea, broth, infusions and re-hydrates food.
  
  Just found images on The Guardian:
  
  And on http://walyou.com/lavazza-argotec-isspresso/