We have a water bowl dispenser for dogs from Petsmart, and it has a built in filter which filters out chlorine, and chemicals. We change these filters once a month.
I buy the cheap cases of bottled water from Walgreens. It's like $2 for a 24 pack. So I give him that. I save the good stuff (Poland Spring) for myself lol. I should probablyinvest in a filter system for his water though to make my life easier.
If we are out Harlea gets bottled water. At home we have multiple water bowl and the main one is a water fountain that has a carbon filter in it that I clean weekly and even then it still gets filled up with filtered water from the fridge.