Another in my line of designs no one could ever possibly want but me!
I make my own SodaStream syrup by mixing 15L of diet Pepsi syrup from a 5gal bag-in-box, with 5L (seven bottles) of Da Vinci diet cherry syrup, for a diet cherry Pepsi mix that beats Wild Cherry Pepsi (which I can't get bag-in-box anyway). I do this in a Rubbermaid 22qt food storage container, which makes enough syrup to last for quite a while.
And what this is, is simply a brace that sits on the lip of the container and has holes for me to put inverted Da Vinci syrup bottles in so they can drain fully and easily into the cola syrup. Yep, that's it.
If you print one, please post an I Made One picture.