Mason jars are a great way to display Bartendro's liquid assets. Not only are they easy to find and clean, they area easy to fill and will let you see exactly how much of each ingredient you have.

This lid is made from polypropylene and fits wide-mouth mason jars.
https://partyrobotics.com/blogs/blog/18271559-a-more-permanent-bartendro-setup

Two holes accommodate 1/4" tubes, metal or otherwise. One is for liquid output, the other for the optional liquid level sensor. The other large hole is intended for use with a funnel to refill the container without having to remove the tubes.

Swivel top closes up the unused holes to prevent dust, evaporation and fruit fly entry.