I’ve been asked how I clean my water line on the bike a few times.

I use a mini water water pump and create a loop. I like PBW as an alkaline cleaner. I’ll do a 15 minute recirc with the cleaner. Empty the Nalgene out then add a couple drops of sanitizer and fresh water and do another 15 recirc. After all that is done I just run a gallon of water through the system as a final flush. This is done once a week.