5-gallon(ish) water jug with separate fill hole?

Almost any of the water places around here, Quartzsite, Flagstaff, Los Lunas,ect. There's machines outside a lot of stores and gas stations that are $.25gal or $1 for 5gal. Most I know about are out here in the west but figure they probably have them most places around the county. Out here they're big blue machines usually.