Where could i hide my 'water pipe'?

Not that I'd condone this sort of thing, but my favorite hiding place was always under a drawer. If you have a relatively good quality dresser, you'll find that when you pull the bottom drawer all the way out, there's a cheap piece of particle board underneath it so that stuff that spills out the back of the drawer doesn't fall onto the floor. Often there's a surprisingly deep amount of space under there.