Bring the adapters and a three into one outlet adapter for when you have access to an outlet too.
Here I have a recharger for AA and AAA batteries, a Li Ion charger for a camera battery and a USB charger for my tablet (not shown) all plugged into an outlet. The three into one adapter helped to get all of them plugged in at once. The outlet was at an empty camping site about a hundred feet from my hiker biker site.