goood luck op. only time ive been homeless was when i lived in my car for six months. i liked it. anyways, as far as advice goes, I say if your going to do any drugs, stick with the natural stuff.
weed, shrooms, cacti. etc
stay away from stimulants(coke, meth), pills, and don't go too hard on the booze.
do your own research before you do something you dont know about.
erowid.org is the best source for info on drugs