Well, I'll tell you this... I too started out with the bottled stuff and it sure gets expensive, but I told myself it was worth the effort because the PH was neutral. Wrong. For me, the best answer turned out to be just use the tap water and treat it. I have high PH tap water and it is heavily chlorinated too, especially after the water company refreshes the system. As a result, I use a water filter for my drinking water.
While the water filter is ok for me, the treated stuff is just fine for my fish. I don't know what kind of fish you have, but for my livebearers, it's fine. It is a lot less hassle and much less expensive too. A little test kit goes a long way and so does a bottle of conditioner and maybe some PH Up or Down, depending on where your water is to start with.
A little squirt of the conditioner will take care of the metals and chlorine. As for PH, 3 drops in a vial will tell you what you have to start. Practice a little with a bucket of water until you can tell how much to add in order to get the PH where you want it. If you also purchase PH Up and PH down, it will help fix mistakes till you get the hang of it. Then you'll only need whatever is necessary to get the PH up or down from where you are starting from.
Easier still, you can set the PH right where you want it by buying the bottled stuff for that purpose. PH 7.2 , 7.0 or whatever. Again, that is an expensive route to go. A little practice and you'll be fine with the PH test kit, PH up or down and conditioner. After awhile, you'll just automatically pop in the right amout to set the PH. It just takes a little practice.
Something else you'll find folks talking about around here is what is the PH of the water you purchased the fish from. If it's somewhere you frequent and it is local, chances are you may be on the same water system. In my case, my LFS is only a stone's throw, but we are on different water systems. Still, their water is just as hard as mine, but I like a lower PH for my plants. Seems the fish are more comfortable too, as they are in the LFS for only a short time. I have fewer problems with ailments when the PH is just above or just below neutral.