I took a winter camping survival course is college. They told us to take red jello with us because it could be sprinkled on the snow for a distress signal and you could also drink or eat it for energy.
Building material, definitely. I mean, first of all, can you say, "ant factory" and secondly, how far do you really think you'll get before your jello bricks just fall over and bloop all over the place?
I guess turning it into booze is the strangest I can think of.
Eating it................. Ew!