I did it!
I thought this was one thing that was doomed..
especially when I forgot to let the jelly cubes melt in the hot water before pouring in the cold water and vodka..thus leaving loads of cubes of unmelted jelly at the bottom.
Then to get rid of these unmelted cubes, I put the mix into the blender for a minute, and it came out looking like banana milkshake..
but, here it is, vodka jelly! (with a lot of vodka too :P)