Our toilet drains all the water leaving almost no water in the toilet. Any help towards fixing this problem will be greatly appreciated.

hi. i've replaced the entire innards of my toilet. i had to use caulking (thanks to advice from a forum member here!) to avoid leakages from the tank. however, i've run into a new problem. the tank is no longer leaking. however, i have a sponge under my water pipe and shutoff valve, and am noticing that a leak is coming out right from the valve itself, not the pipe. i really don't want to replace either the pipe, or the entire toilet, as we'll be re-doing the bathroom in teh next year or so. is there any stop-gap measure i can take until then, just to ensure no leaking from the valve itself? many thanks in advance