An intact blister is safe from infection. Apply a padding material around the blister to relieve pressure and reduce friction. If the blister bursts, treat it as an open wound. Clean and dress it daily and pad around it. Leave large blisters intact.
Diarrhea is a common, debilitating ailment when in the wilderness, caused by a change of water and food, drinking contaminated water, eating spoiled food, becoming fatigued, and using dirty dishes.