You can pick up a Sharps container. Honestly, it’s just a container to hold water with a lid, doesn’t need to be anything special. They also come in various sizes that fit perfect in a stand with limited space. You can also find them in Red, Yellow, translucent almost CLEAR. The Flat top ones have a small opening to feel the pump though. I like them because you can get THINNER shapes and sizes to fit in smaller stands. Easy to clean as well. Just watch that you don’t drop or whack them as they can crack easily, but to just sit and hold water they are perfect and cheap enough to buy 2-3 and have a backup you can stack