Step 9: * bonus* first attempt
My first attempt was to make a square receptacle. I tried making corresponding cuts in cardboard and assemble them together perpendicularly. After spending a while getting the cuts right and gluing down all the sides I felt like it just wasn't what I wanted. Besides, I wanted 25 days and this option just left me with 24.
I have seen in some restaurants and bars when they ship new glassware they are packed in boxes that would work perfectly for this. Short, evenly segmented squares in cardboard. I gave up after a week of asking and went with tubes instead. Patience, good quality cardboard and a sharp knife may make this option viable for some.