Potable water is available only at Windigo and Rock Harbor. Fires are only allowed at a few selected campgrounds on the island, and only in designated fire pits. Hikers and campers are recommended to carry a water purifier and self-contained camp stove. Potable water is available at Windigo and Rock Harbor on Isle Royale. All water collected elsewhere in the park should be boiled for 2 minutes, purified, or passed through a 0.4 micron water filter prior to consumption.
Dehydration is a problem in hot weather.
Be sure to carry at least 2 quarts of water per person and drink as much water as possible while near water sources. Weather and lake conditions can deteriorate unexpectedly. Temperatures can drop rapidly, especially near Lake Superior, where water and air temperatures are cool year-round. Please bring appropriate dress for both cool and warm weather, as well as rain and foul-weather gear. Bring a good first aid kit when hiking or paddling, as well as a sufficient supply of any needed medications.