Some fun, tasty, and/or helpful things!
Looking forward to seeing y’all there! 
The mountain dew thing was totally a hoax years ago. Shame on them for not doing the proper research. XD
The only thing needed to add to a bottle of water is a tiny bit of bleach, but that’s only in the case of long term storage to prevent the formation of algae. That said, this is still an awesome contribution!
I’d add a bidet to the list. The fantastic add-on of a condiment bottle~! Served a great many in the past.