If you have power nearby or can run an extension cord, these in a 5 gallon bucket waterer have been life changing:
https://www.amazon.com/Pet-Products...t=&hvlocphy=9002189&hvtargid=pla-387333272375
https://www.amazon.com/Pet-Products...t=&hvlocphy=9002189&hvtargid=pla-387333272375