Any hose will work on a barb, you can go to the hardware store and get it as long as your using it for water in your jacket. If your using oil or a different fluid check what’s compatible with the fluid and then order the hose
It’s not the cheapest but I like the silicon tubing. Walk in to home depot with the connection. Walk to the tubing section. They have those clear tubes with mesh like structures inside for what I assume is for durability. Find one that is slightly undersized, hair dried or lab heat gun. Then normal hose clamp of your choice over that…
Edit. Well for water you’ll want something dark to avoid algae growth! I dont run water in mine so I forgot to mention that
DERNORD Stainless Steel Quick Disconnect Set - Beer Brewing Connector Kit (Barb Female/MPT Male(Pack of 2)) Amazon.com
Get these and some 1/2" ID braided vinyl tubing and some hose clamps. Should be at home depot.