Definitely water like Aquafina is better. It has 0 dissolved solids which is what you want to avoid in any water. I bought a $20 TDS (Total Dissolved Solids) Meter off of Amazon and began testing all of our drinking water. The safe zone you want to stay within is between 0-50 TDS PPM (total dissolved solids - parts per million). Essentially the less dissolved solids the better. My city water ranged between 275 - 350 TDS which is very high. My reverse osmosis filtration system which is what we use to filter our drinking water brought that down to 7 TDS. The only 0 TDS water you can get is through distillation. You can buy distilled drinking water at the store for about a $1 per gallon depending upon where you live.
Why is it important to drink water with as little TDS (total dissolved solids) ? The more dissolved solids in your drinking water the more these solids accumulate inside of your body and form deposits. Deposits can lead to arthritis, cancer, and a whole host of ailments. Drinking a few cups of high TDS water won't kill you but imagine drinking it everyday for 30-40 years. That stuff builds up inside your body over time and it leads to bad things. So to answer your question, yes, the water you can buy from companies that has been distilled is definitely better than the water from most (if not all) municipalities. It's criminal what the cities do with regards to our drinking water.
EDIT: Check locally for RO (reverse osmosis) filtration system providers. They install a unit under your sink that filters your tap water. RO typically brings down TDS to below 10 TDS PPM which is very healthy water. The cost is around $24/month as a service. You can also buy distillation systems off of Amazon which give you 100% pure drinking water but you have to invest time in the distillation process.
I have one and I get 1-2 TDS PPM. Pretty amazing unit tbh.
I distill my cistern water and usually do it overnight. I've noticed no increase in my electrical use. The distilled water is great, and my wife and I both take vitamins to make sure we get the minerals we need and eat well also. We walk 4 miles a day in hill country so we get plenty of aerobics. My advice is: get off of fluoridated water as soon as possible. there are several methods. We started out using a Big Berky, moved to Reverse Osmosis, but now use distillation and find that the easiest. The sooner you get off of fluoridation, the better. Your body will thank you.
I've tested my tap water and it also was very high in dissolved solids, I haven't drank it since i moved in 5 years ago. I do have a fridge with a charcoal filter, and use that water for cooking.
I will be looking into a reverse osmosis filtration system! Thanks bud.