Son was in state residential treatment programs the entire year. I did not pay for lodging or meals but did help with other living expenses. Can I deduct those expenses?

No, living expenses aren't deductible.  However, residential treatment is considered as a temporary absence from home so you may still be able to claim him as a dependent. 

As well, you can claim medical expenses for a dependent. This would include the necessary travel to get treatment. Medical expenses are limited to greater than 7.5% of your AGI, and you can read more about what qualifies here: Medical and dental expenses