One more vote for PEX.
I am working on a lake barn and have built an apartment in one corner. It is approx. 1250 square feet. Not a great deal of PEX but, still a fair amount.
I would also advise using Sharkbite clamps and brass fittings. Might be a bit more costly but, I doubt the brass will fail. I would worry about the job had I used the plastic connectors.
Good luck in your improvement.
You need to doubt. Its proven that the brass fittings do freeze and WILL split. Every issue we've had here with unprotected pex that I"ve heard of, has been a cracked or split brass fitting. The pipe has been fine.
