Yes, especially when hiking. We've had giardia once and I don't want to deal with it again. That said, I don't freak out if they grab some puddle water or whatnot, I just don't want it to be their main source.
if we're walking around town or in the woods i buy a bottle
of spring water with the sport. i tilt the bottle down and give
a little squeeze and he drinks the water. i reuse the bottle a couple of times filling it with filtered water from home. if we're visiting i take
his food bowl, water bowl and a gallon of filtered water from home.