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dangeek
If I was doing a van from scratch I'd forget an old school lead acid leisure battery and run the whole lot off a decent USB power bank. If you need 12V for the water pump use the starter battery. It's not like you're going to drain it with a few seconds use. You could also consider one of those camping power pack things.
(my actual van has a ludicrously elaborate Arduino-powered dual battery 24V system, for Reasons)