Coffee. I normally drink 3 cups of Nescafe Instant a day, made with 50% milk in a microwave and 2 spoons of sugar. The closest I can get to that in the wild are the Nescafe Cappuccino pre-packaged sachets. These include a milk powder that provides some froth, and some sugar. I carry extra sugar.

I also keep these sachets in the house to drink when I run out of milk. That way I have a chance of getting through my stockpile before it expires, and they taste good enough that I can put off buying milk a day if I need to.