Bees need water too, especially here in the desert Southwest.
I keep a bright blue birdbath filled with water and rocks which enable my girls to drink their fill without drowning. It’s only April and already there are 10-20 bees siphoning water at any given time.
Longtime city beeks tell me that mostly any water source will do, but make sure it’s not treated or otherwise chemically altered. Pools and artificial ponds, for example, are NOT a safe source so unless you have a rustic creek in your backyard, your best bet is to provide a supplemental water source most of the year.