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.