In case you were wondering, he immediately ignored the instructions to only carbonate plain water and carbonated some home-made lemonade - which apparently made a tiny bit of an exploding mess (I wasn't there to see so I'm not sure how accurate the "tiny" part is ). Next time, we will be carbonating water, then adding the lemon juice and simple syrup.
The fizzy lemonade is great though. Even better with a little bit of ginger liqueur or home-made beet-infused vodka. I think many other things will be tried with fizzy lemonade in the days to come . . .
Beet-infused vodka? Do tell.