Pipes that are one size larger than conventional will supply several faucets simultaneously and all that your main has. Like a shower and a lavatory and commode at the same time with no pressure drop. To keep the water temperature balanced, you have to run the hot water and cold water lines the same route to keep the pressure drops the same. So ideally, Run 1" hot and 1" cold insulated lies from the hot water heater to each of the places that use water, i.e. each bathroom, the kitchen the utility, any possible extension to the house. That is separate pipes for each, from the heater to each bathroom. It's more pipe, but solves all the problems. Each line ties to a cold water header and a hot water header at the hot water heater. Have easy to access shut off and drain valves. 1" flexible (a coil), seamless K thickness copper pipe, inside a black flexible plastic (irrigation) pipe and insulated. No solder joints without future access (like only under the sink where you will change size). Put them in a fur down if you have to keep them warm and not exposed to winter freezing temperatures. Have easy to access shut off and drain valves. Someday you will think it is one of the smartest things you ever did.