Yes you can! Our BPA free RinseKit can be filled up with portable drinking water for pets and people. It can also be filled with other liquids like soap or cleaning solutions. If you choose to fill your RinseKit with a liquid other than water, we do not recommend drinking from the RinseKit later. If you use your RinseKit as a cleaning budding or sanitation device and want to fill it with a cleaning solution, please follow the guidelines from the CDC before you do so. For directions on bleach use, please visit: https://www.cdc.gov/healthywater/emergency/cleaning-sanitizing/household-cleaning-sanitizing.html