Carve Hole in A metal water bottle model I am making a 3D model out of my stainless steel water bottle but I can't get right the carved part on the bottom of the bottle 



I tried using the boolean modifier coupled with a bevel and a subdivision modifier but still not what I wanted 


I used a Triangle made from a plane and a solidify modifier and bevel the sharp top edge to make the boolean. Here are what it looks on my blender file 



And here is the reference image for the bottom part of the water bottle taken by me 



Also since I can't make the edge correct for the bottom part I was worried on how to make the Curved Hole on the bottle Cap (I haven't started the bottle cap so I'm just asking for advice on how to do it)

Here is the reference image for the top and front of the bottle cap 





I have no idea on how to make this correctly and I would like some help. Thanks for the future advice and help
For the bottom of your bottle you can model it, use a Mirror modifier as it is symmetrical, give it enough topology as it will need to be bent, duplicate with an Array, then at last use a Simple Deform / Bend mode to make it turn around 360°. Apply the Array and Simple Deform and remove the doubles.



For the bottle cap it seems a bit more complicated as the cut shape doesn't deform to the center. So what you could do is create a cylinder, only keep a segment, bevel it:



Cut a hole, for example with a Boolean modifier or just some vertices displacements. Extrude downwards, fill the faces.



Create an empty at the center of the cylinder object. Give the cylinder an Array modifier > Object Offset, with the empty as Object. Rotate the empty so that it recreates a cylinder.



Give your object a Subdivision Surface modifier, bring some corrections to the topology in order to sharp the edges etc.