It all depends on your setup. If you're using a rack with a enclosed sides, you might not need to use hides, if your animals feel secure enough in their tubs without them. Only way to really determine that is to observe and note their feeding habits with hides and then without and making an informed decision from there.
As to the water dish, that might be dependent on the big time breeders humidity levels in their tubs and racks. A larger dish is going to give more surface area to evaporate the water, thus increasing the humidity. Again, check your humidity levels and if they're good where they are, I wouldn't change them. Some snakes like to soak (my albino will occasionally take a dip, for whatever reason) while others do it to rid themselves of mites. As a general rule you don't necessarily need to provide a dish big enough to soak in. I'd caution you on the size and depth of the dish for neonates, as they could drown in one that's too deep but since yours are juvenile or sub-adults, I wouldn't think that would be as much of a concern.
Whatever works best for YOUR animals is the bottom line. Hope that helps and good luck!
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