Try giving Wunderlist a go. It's free and works well. You can build any type of list you want, share with others, make it public, etc. I use it all the time for stuff I need at the store, maintaining my honey-dos, etc.
Something else to consider... when building your list, you'll find you need certain things every time you go camping so they'll pretty much stay in the camper whereas other items like food, drinking water, beer, etc. will have to be moved in and out as needed.
Mike, Sue, Sissy and Little Man
2015 Ford F350 Lariat FX4 6.7 CC DRW
2015 Eagle Premier 351RSTS