I am having a new bathroom put in and I am trying to figure out the supply line lay out. The bathroom will have a shower stall, toilet and sink. Water suppy will be from the cellar to the second floor. There is only room for a couple Pex lines up the the bathroom maybe more. I was thinking about running a hot and cold pex line up then manifold/tees/??? to the fixtures. Not sure what size PEX to use 1/2 or 3/4 or if I need seperate PEX feeds from a manifold in the cellar. That would be difficult but I might be able to figure out a way. My thought was to (and I am a rookie at best) Run a 3/4 cold up to feed all 3 fixtures and run a single 1/2 hot up to feed the shower and sink (less volume to exchange to get hot water to the shower).
Also, is it better to use/build a manifold or use PEX tee's?