gravity bongs are always fun and super easy to make.
what you need:
empty 2 liter bottle
bucket (anything bigger then the 2 liter that is able to contain water will work)
bowl (ratchets will work)
tap water
how to do it:
1) start by cutting the bottom of the 2 liter off. how much you cut off decides how big the chamber will be.
2) take the cap off the 2 liter cut or melt a hole in it big enough so the bowl can fit into the opening you have made.
3) fill water bucket 3/4 of the way.
4) submerge the cut 2 liter bottle so that only the curvy top part is sticking out of the water, put the cap (with the bowl inside it) on the bottle
5) pack a nug, lite and is it is lit pull the bottle up (dont let the bottem come out of the water)
6)when bottle is full of smoke take off the cap put mouth on and push the bottle down (forcing all the smoke into your mouth)
gives you a rough hit, enjoy.