Can you make strawberry extract at home?
Some essences and herbs need alcohol to be extracted, but not strawberries.

Extracts from berries can be made in the pressure cooker, to later turn into syrups or jellies.  Here's a step-by-step photos and instructions on how to do it.
http://www.hippressurecooking.com/2011/08/blackberry-italian-soda-from-your.html

You could then mix the syrup with vodka, instead of mineral water as in the recipe, to make a strawberry cocktail.