As usual. Much like bathing a toddler being potty trained - accidents will happen but life goes on.
Easy. Okay to shower with all parts of your appliance off, hair dryer area then reapply appliance. Also okay to shower with waiver only. Or any combination. Good question.
Colostomy. Some patients cover their colostomy with a watertight dressing such as a band-aid or cellophane and tape.