If you have a supply of running water, the big blue spigot jug you can get in the sporting goods section at Wal-Mart is great. This and two white plastic tubs from the housewares section is all you need. Fill the jug with as much clean water as you need and set it on the edge of the picnic table. Place the wash tubs on the bench under the spigot and there you have it. Wash in one and rinse in the other. If you want to get really fancy, you can boil some water on the fire and add it to the jug when it's almost full.