I was just thinking that all of us do things on a daily basis that would constitute as a tip and this may have been talked about before but if not:
Sometimes I'll be on a job where there is no janitor closet or good means to fill my tank up . So what I do is use the plastic core cover as a hose , wrap it around the faucet let it drop into the tank and fill. You might have to help direct the water at first but it just runs down the inside of the liner and you're good to go. shake it out when done ,fold in half and roll up. when I need it again I rinse the outside off ,just in case ; and I replace it every so often with a new one.

hope it helps