I use two 6 gal portable tanks, and an electric transfer pump from Harbor Freight. It takes less than 2 minutes to transfer the water into the clear water holding tank, with no labor involved. The pump is around $25 from any Harbor Freight store. No need to remove the portable water containers from your truck, if you need more water, just fill at any potable water source, and use the pump. I find I use more water doing dishes than any other reason while boondocking. Even a shower, if done prudently does not use that much water. I have the optional outside sink on my Hi Lo, and I use the two tub method (one wash, one rinse) for dishes and water the plants with the grey water. If you use bio-degrade-able soap it is no big deal.
Enjoy dry camping, it is a lot of fun!