Tap water probably is not the best thing you can do. It's not going to kill you instantly, but over time there are almost always things in tap water that you don't want. There's PCB's and pesticides. Now they tend to put chlorine in it to kill off any bacteria, but that's also a problem. Chlorine is highly toxic material. We don't think about it because we have it in our pools and what-not, but chlorine gas is one of the most deadly gases.
So, in my opinion, you should have purified water. That comes to like, what should I do, should I buy bottled water. That's also been sitting around for a while. It's also in contact for a long time, maybe months, with plastic. Plastic tends to leach PCB's and other things that we don't want in our system.
So, in my opinion, the easiest and best way to drink water is to get a water filter. It is the best way to get your water. You're going to get it fresh and newly cleaned. In my opinion the best is just getting a granulated charcoal filter combined with a KDF filter which takes out a lot of the metals. If you want to go even further and really make sure your water's clean reverse osmosis is another one that's very good at purifying water. It tends to take out even some of the healthy nutrients, though.
There is also distilled water which I'm not overly big on because it's, literally there is nothing in the water. It's not a natural state for the water, and I've heard stories of people that drank distilled water and it actually leached minerals out of their body. They started having bone issues and whatever. I'm not saying that's always the case, but I do know a couple of people that had that issue.
So, I wouldn't generally drink tap water certainly for long periods of time. If you're going to over the years always drink tap water I don't think that's a good idea. I think it's just prudent and safe to filter your water and get it as pure and natural a state as you can find.