Hoses are one thing. So far, my worst scare was when I was using a macerator pump to empty my tanks into a semi-buried 250 gallon external dump tank (which was occasionally emptied by a honey wagon.) Someone walks up, and nearly pulled the other end of the hose out to take a drink before I ran them off.
Just because I don't want to take chances, I have my white hoses in a bin for fresh water use. My rinse hose for the macerator pump as well as the hose for the output from the macerator pump to the sewer drain are oversized black rubber hoses with "NOT FOR POTABLE USE - DO NOT DRINK" stamped in block lettering on them. Oh, I use gloves and after the gloves are put away, I use gel alcohol on the hands. Shoes and such stay on an entrance mat (since I don't want to grind sand into the RV's flooring.)