live out of (something)
To survive off of that which is contained within something. I'm on the road for three months at a time for work, so I've gotten pretty used to living out of a suitcase. I've been living out of my car ever since I was evicted from my apartment. The electricity has been down for weeks, meaning we can't keep any food in the fridge or cook anything on the stove, so we're living out of cans for the time being.