I have a teenage daughter who has long hair and takes extremely long showers at home. Best way to conserve water is to do what CottageGirl said: jump in water, soap, jump in again to rinse, apply conditioner, jump in again to rinse, come out and rinse with fresh water, brush it out. Viola, clean, fresh hair. My daughter also keeps her hair in a long braid down her back for most of the trip to prevent tangling and split ends.