@shelley2shoes,
Start here with asking these 3 things of what you want:
1. ask him to move out
2. ask him to move out
3. ask him to move out
Seriously, the possibility of a lasting and meaningful relationship and things being balanced and equitable has been erased. The precedent for him taking advantage of you is now set as he's not being a 'big boy'. He should be cooking on a schedule or helping right along side you as you cook. He is getting away with things. How DARE he offer advice about what your daughter does or doesn't do.
As far as how much he should pay, it doesn't matter what he says can afford.
Why is it that you are focused on that issue when it is YOU that is being taken advantage. It's an easy math problem to deduct your daughter's food costs, but that IS NOT and should NOT be the issue. Don't allow that to fog the REAL issue.
If you're laying out all the money for HIS living expenses and food , how is that YOU can afford it? When did you apply for a adoption or a dependent. He's sure seems like a freeloader. Lose him and move on - seriously!
You're doing shopping (charge for time)
You're doing cooking (charge for time)
You're doing house work (charge for time)
His presence there is VERY beneficial to him and very convenient.
I'd charge him restaurant fees.