I wondered about this...You bring up an interesting point. Typical garden hoses are labeled with a warning against drinking from them because of possible chemical leach out from the lining. To fill the coop drinkers, we bought a white hose intended for use with RVs which is safe for drinkable water.
Because of the chemical & lead warnings I only use the hose for washing down the loft floor, not for their drinking water. But it would be so much easier in the summer to use the hose for drinking and bath water too.
Thanks for the tip Terri - I'll look for a white RV hose when we replace ours.
Oh, and I would definitely drink the water I give my birds. Even with garlic or vinegar in it. I sometimes put ACV in a glass of water for myself and drink it, so why not?