i have 1/4 in thick acrylic, that will be used to build a resevoir. it will be someting like a square bong,like square mj bong

n e ways...would it be ok to tap this thin acrylic and put a barb in it or no? should i just drill the hole it and put pvc cement? what else would i use to waterproof it?
do they make clear pvc cement. my theres some in my garage but it looks like it dries blue