I am adding a bathroom in our basement and all is going fine, but...I am wondering how big a supply line is needed. We currently have a 1 inch supply coming into the house, and it splits into 3/4 inch to the hot water heater and 3/4 inch to the rest of the house. The new bathroom supply will go to a toilet, sink and shower as well as a pre-existing hose bib on the outside. Will splitting another 3/4 inch line from the 1 inch house supply to the bathroom be too much? Do I dare just use the 1/2 line that currently goes to the hose bibb? What do you all suggest?