Also, it might be a good idea to have an extra water dish handy so that you can double up on water if you know you'll be leaving for a few days. That way you should be covered even if there's some kind of incident that keeps your mom from checking on him after you ask her to. Reeses will be fine, anyway. As long as he's not going without water regularly or for long periods of time (and I know you're not letting that happen), it shouldn't be a big problem that this happened.