I often tent at Lost River in North Woodstock. Sites have water, sometimes electricity, clean showers, etc. They're located roughly 5 minutes west of Lincoln on Route 112. There is a really good Italian restaurant about a mile from the camp whose name I can't recall. Lincoln has numerous establishment/services if you forget something: groceries, a flashlight, hat, beer, etc. If inclined, see their Internet address below.
Enjoy.
http://lostriver.com/