I had to leave the gym many years ago for a few reasons. I was a full-time student, worked 2 jobs, and couldn't afford the gym dues. Eventually I ordered a Weider squat rack off of ubid.com that came with a bench and a cable pull down attachment on it, made myself a 2" thick bar for about $30, and picked up some odds and ends weights from different places pretty cheap. I had enough to do benches (incline, decline, flat), close grips, chins, rows, curls, squats, deads, stiff legged deads, and another creative thing or two...so what else did I need?
Eventually I needed a better place to squat so I took two 55 gallon steel drums. I placed them about 5' apart, placed my squat bar across them and used it for a squat rack. Get under it, step back, squat. You could get creative and get a pair of old used car tires and use that for weights as well...just in case you had to bail out from under a squat. The tires would soften the blow on the floor, the bar, and the plates...and would give you anywhere from 25-50 lbs of extra weight per side on the bar (depending on what size tire you got).
You can do it man...you just have to be creative enough to find a way. You are only limited by your imagination and you intensity.