i'm not sure about everything you've posted on but i do know that you should only be feeding him once a week. it isn't healthy for them to be fed more often (makes a fat unhealthy snake).

i'm sure others will be along soon to comment on the rest of your set up and the water dish...

one more thing though... are you sure he doesn't have mites cause sometimes when they have mites they soak in the water dish... (looks like black specks of sand)