There exists a recipe for ice cubes, because, as the person who posted it explained:
I’m publishing this recipe because I’m sure that there are other families who have members, who don’t know how or have forgotten how to make ice when the ice tray is empty.
And it’s pretty simple: two minutes to prepare, let stand in the freezer for two hours, and there you have it. Beyond the capacity of coworkers, though.
More amusing, perhaps, are the categories under which it’s listed: among others, Beverages, Very low carbs, and Lactose Free. Not a speck of gluten, either.
(Tip from @GaelFC: “Do not substitute vodka.”)