The stuff HCE posted looks pretty good. I have considered running 3/16" brake line, although I think it would be a pain to run the price is right. Get a loaner flare tool at the auto parts place and you're in business.
Better would be teflon hose with braided stainless outside. Way overkill for the low pressure application, but certainly will last a while. Its thick enough that its a little bit of a pain to run still. I used it on my fuel pressure gauge for assurance it wouldn't leak in the cab, and would use it for oil press if I didn't have an electric gauge. anplumbing.com has the teflon/stainless hose and DIY fittings for the ends.