I bought an old home 3 years ago that sat 2 winters without heat in northern PA and I had a million leaks. I cut the pipe at the line coming into the house and ran ĺ to the water heater in and out and to a hot and cold manifold I made myself. I will look and see if I can find some pictures of it. It is made from the copper ones you can buy with no valves. From there I mounted all my shut off valves and ran homeruns to almost everything with Ĺ inch. The exception is I came off the other end of the manifold with ĺ and went up to the second floor bathroom and then branched off for the toilet, tub and sink. If I had it to do again I would have made that run as Ĺ as well as all the ĺ did was make it longer time to get hot water on the second floor wasting more water. I should have used the ĺ run to my outside water where more flow is better. I did join a hot and cold with valves for each outside faucet and if I want warm or hot water out there I can flip a couple valves in the basement and have it. It works really well at my hot tub as I can top it off with hot water or like yesterday I used pure hot to spray off the ice out there and clean the filter.
One place I didn’t want to disrupt the end of the old copper the washing machine and I used SharkBite couplers and they work great just $$$. The other place I used them was they sell a flex Water heater connector with a braid covering and sharkbite about a foot from the tank. This is going to make tank replacement a simple job.
The fittings I like best are the stainless bands that crimp as they are really strong and the one tool will do all sizes of bands. After they are crimped and they seal you can still rotate the connector. That tool also fits in the tightest spots. I bought the crimp tool and the PEX cutter for under 50 bucks. I did a whole house and didn’t have one single leak.
If you look at this thread and post number 24 you can see a photo of my setup.
I have added a few more runs after that photo.
You can get PEX adapters so that you can go straight to things like sinks and such but PEX is stiff enough it makes connections harder to do so most of them like the kitchen sink I still added the last hose a flex piece similar to how you would do with solid pipe. the difference is use the PEX ball valves rather than those cheap little shutoffs IMO. That is if you even want a shutoff other than the basement one. I put shutoffs here and there just to make it easier in the future to work on things. You make the call on that.
Good luck. PEX is fun.
Oh I did all white just simpler than buying twice the rolls. Get some red electrical tape and label the ends of the hots. And the corner benders work great some shown in the pic.