You can prevent illness by washing your hands often; before eating, after using the bathroom, after you change a diaper, and any other time you may need to freshen up. Since water is such a precious commodity during an emergency, you should remember to prioritize the use of purified drinking water. You may want to use it first for drinking, cooking, washing dishes and then for other purposes.
Be organized and choose a designated bathing area. If you wash in a river or stream use biodegradable soap and always be aware of others who may be downstream.
With a little soap you can also wash yourself in the rain. Other washing alternatives include moist towelettes, a spray bottle, sanitizing lotions, or a wet washcloth. Be sure to wear shoes to prevent parasitic infections and to protect yourself from cuts and puncture wounds that can easily become infected.