This is probably a long shot, but does anyone know where I can get a 5 gallon water jug (empty or not) with gallon/liter measurement markings on it? Yes, I know I can make my own on any jug but this would save the time of measuring (2L at a time). Thanks in advance.

Cambro has numerous in various sizes & markings. Here's one: https://www.webstaurantstore.com/cambro ... VAEALw_wcB

And a link to their catalog: https://www.cambro.com/catalog/

And, since the above has marks at 4qt/4L you could use a Sharpie mark 2qt/2L...

Thanks. That might be a possibility. Was more looking for the typical 5 gallon water jug shape (like you see on the top of a water cooler).

^ I'd just take an accurate 2l vessel, 5 gal carboy on a level surface, and mark off 2l increments...boom. Not sure about your overall plan, but after going with carboy containers years ago and trying to swap out when empty for another full carboy, the process of bleeding the system and espresso machine group each time was a RPITA.

So, wide mouth water container that you can refill easily is the best way to go.

If you haven't perused this thread: Espresso Cart - Goodbye Plumbed In