Canibul, we store our Island Packet on the hard
season, also. We simply empty the entire tank before we haul out
. After we launch, we fill our tank. But usually before we launch, we will put in a couple of 5 gallon jugs-worth, just so we can wash our hands, etc., while we are working in the yard.
I'm sure everyone has their own way of doing things, but that is what we do. Hope that helps.
I forgot to mention...we haul those 5 gallon jugs up using the davits