I hope this is the right area to post this.
Anyway, someone was telling me about a chemical that, when mixed with water, gives it a jelly-like consistency. That is, the British definition of jelly. Now, does anyone the name of a chemical that does this at room temperature, within several hours? It'd help if it were easy to make/obtain.
I'm not sure if gelatin would work because it needs a pretty cool temperature to set, I believe. I'm not even sure if I could get find gelatin (third-world country). Might make you wonder how I would get access to whatever chemical you may prescribe, but hey, it won't hurt to try.
The reason I need this is for a (harmless) prank, if you must know!