My kids go to sleep with GIANT sports bottles by their bed. And, amazingly enough, rarely have to get up in the middle of the night for potty. My son actually drinks the whole thing down most nights.
Just FYI, I've found that requesting drinks or food can sometimes be a delaying tactic. So, we've taken the possible excuse away: "you've got plenty of water right here in your bottle. now go to sleep. good night." (To deal with the food question, we have a "last call for food" about a half hour before bed. If they claim hunger at bedtime, we tell them sorry, we had last call, and they were supposed to fill up then).
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).