I will not be able to explain it right, b/c I don't know what the thing is called.
The thing that allows your toilet tank to fill up and then shuts off (whatever that is called). Put one of those in a HUGE bucket/ trash can / keg tub / used floralife tub (cut shorter)... this would need te be secured in there and the opening large enough to still fit like one or two large vases in there when you dunk.
Then when hooked up to the water, you come out of the cooler, dump the old vase water, dunk the vase in the tub and it fills automatically and then shuts off.
When doing a "round" in production, you can dunk all 12, place on a cart and wheel to your table (or carry if you have the box). I find this is faster than our hoses above the table. At a holiday, I have a teenager fill the vases and "set up" the tables with flowers for the designers.