Does anyone happen to know of any companies that make beverages or water in very small packets? Something like survival water ration packets but much smaller - say 3x2.5 inches.
Or extremely flat and small bottles?

I want to experiment with carrying something like that in my pocket while trail running. On longer runs I usually carry a fist bottle, but sometimes I run in a pretty rugged terrain and need to have both hands free in case I stumble over a rock or slip.
A hydration backpack would be solution but I want to try something more minimalistic first.