Why am I not losing weight?

I eat one meal a day, it's usually larger, not giant, maybe like a 12 in sub and a small bag of chips. My job is very physically demanding so I don't go to the gym, (its probably not nearly as affective as the gym but I'm active) yet I'm still fat. Why? I don't really eat horrible foods, mainly just cold cut sandwiches chicken and pasta and stuff. Haven't lost a pound yet. I mean granted I'm homeless and can't afford 3 meals a day cause I live in my car and gotta buy gas and water and pay car insurance and stuff, so it's not really a diet, it's more of a circumstance, I've been homeless 3 weeks now , will I lose weight eating like this? Also I only drink water.
Why am I not losing weight?
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