I'd suggest a removable tank, preferably 5 gallons or less. Once you install a tank, now you have to empty it. You probably don't want the expense of a deckplate, and hoses for a marine pump-out.
If you can remove it and take it to a shore facility, a toilet, you can just dump it like a porta-potty. Five gallons of water will weight 40 lbs, plus the tank. So any bigger gets to be a challenge to muscle out of the bilge.
If you do want a pump-out capable tank, have it professionally done. You don't want to collapse it the first time you empty it.
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