Roughly $33 a day after rent. Not sure if the rent includes heat / air. But they get to eat 6 of 21 meals (in clubhouse of home games) free, if I read that correctly but do have to pay for food when they are away in clubhouse?. I know a lot of people that work minimum wage ($8.10 / hour) for far less a day to live on. That being said, I think it is ludicrous that they are not paid during spring training. I would assume they cannot work another job during that time, so money is just being spent without being replaced by wages. I, also, think that having to pay clubhouse dues on that wage is silly. The club needs to pick that up.
My son hopes to be in that situation in a few years. Right now in college he lives on about $30 a day after rent and does fine.
I can tell you in my early 20's, I have multiple roommates and lived pretty simply because I was just starting out in my career. Somehow I always found money for pizza and beer 
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I do think they clubs should invest in these guys with a year round salary