Yes. Purified water is safe for dogs, and in most homes it is the same water the people are drinking. The more useful question is what your supply carries before purification, because the dog drinks from it every day, drinks a lot of it for its body size, and cannot tell you when something tastes wrong.
The short answer, and why it is short
Purifying water takes things out of it. Nothing is added that a dog needs to avoid, so a bowl filled from a reverse osmosis tap, a carbon pitcher or a countertop distiller is fine for daily drinking. Dogs get almost all of their minerals from food rather than from water, so removing dissolved minerals from the bowl does not open a gap you need to fill.
Purified means different things on different machines
Purified is a loose word once it reaches a kitchen. Reverse osmosis pushes water through a membrane and sends most dissolved solids to the drain. A distiller boils water and condenses the steam, leaving the minerals in the boiling chamber. A carbon filter mostly handles chlorine taste and some organic chemicals. All three fill a dog bowl safely; they differ in what they leave behind and in what they cost to run.
The bowl is usually a symptom, not the problem
If you are asking because the dog sniffs the bowl and walks away, or the water smells of chlorine or rotten eggs, the fix belongs upstream of the bowl. Chlorine taste comes off with carbon. A sulfur smell on a well is usually hydrogen sulfide and needs oxidation followed by filtration. Slime that returns in the bowl within a day points at bacteria, which is a testing question rather than a filter question. On a city supply your utility publishes an annual Consumer Confidence Report and the EPA maintains a finder for it, so you can read what is in the water before buying anything.
Well owners have one extra job
The EPA is clear that private wells are not federally regulated under the Safe Drinking Water Act, so nobody tests yours unless you arrange it. A USGS study of 2,100 private wells found about one in five carried at least one contaminant above a human-health benchmark, and the dog is drinking from that same well. Our well water testing guide covers what to order and how often to repeat it.
Questions people ask about can dogs drink purified water
Is distilled water bad for dogs?
No. Dogs take their minerals from food, so distilled water in the bowl is fine for everyday drinking.
Can dogs drink filtered tap water?
Yes, and for most homes a carbon filtered tap is the easy default because it removes the chlorine taste that puts some dogs off their bowl.
Will purified water stop a dog getting sick from the water?
It depends what is in the supply. Reverse osmosis and distillation cut most dissolved contaminants, but bacteria on an untested well should be found by a lab test and fixed at the source.
Should I give a puppy purified water?
Purified water is fine for puppies too. What matters more is a clean bowl, refilled daily, from a supply you have actually had tested.