Harry initially thinks that Comed-Tea might be usable to rewrite reality to his wishes with a simple Confundus or two, based on his inaccurate assumption about the Comed-Tea causing things to happen rather than future-things causing an impulse to drink Comed-Tea. However, once Harry realizes how it really works, he essentially writes it off entirely, only busting it out once or twice later when he knows it will be highly enjoyable for him to do so and then forgetting about it once it's gone.

Several related thoughts spring to mind to me for other possible uses that Harry didn't consider:

1. He could still potentially use the Comed-Tea as a warning by conditioning himself or hexing himself to find certain dangers bizarre or humorous. He could test whether or not it's possible to use Comed-Tea as a means of retrieving other future information as well.

2. Comed-Tea is remarkably precise. It's constantly scanning the immediate future for events the drinker will find the sort of amusing or surprising that will cause them to do a spit take. If Harry could reverse engineer it or otherwise obtain the recipe and figure out how, magically, that effect is created, he may be able to replicate the effect; or more importantly generate other effects with some changes. It may be that changing a single ingredient could cause it forewarn the drinker of dangers an hour away by giving them profound goosebumps on their left thigh, or stirring it counterclockwise instead of clockwise for the last bit means the drinker will feel a distinct tingling sensation whenever someone appears just behind them. Heck, there's a non-zero chance that research into Comed-Tea could produce something akin to the main canon's Felix Felicis potion in terms of its ability to direct the user into circumstances that will be favorable to them. It's a small chance, sure, but worth investigating. There could be all manner of interesting products, and if nothing else it stands to improve understanding of both Time and Divination.

3. Not sure if this would work at all, but a friend of mine suggested that the cans of Comed-Tea themselves should have something highly amusing or shocking about them that occurs once you've drunk a certain amount, or purchased multiple, or some chaining action--it's not clear exactly how the cause-effect relationship works in this context, but there might a not-quite-but-approaching-"Do-Not-Mess-With-Time" sort of way to cause the act of buying and drinking Comed-Tea itself to be self-sustaining, with you constantly having impulses to drink more and more with future shocking events continuously occurring. If it works, it could be very addictive, so Harry probably wouldn't swing for it, but he might be able to share some sort of business ideas with the Comed-Tea people to increase revenue in exchange for a cut if he can refine it. My suspicion is that this would not work, but again, something potentially worth testing, probably as a part of the experimentation done on # 2.

Any fun thoughts on Comed-Tea? I find myself very interested in it and low key wishing it had still popped up a bit more frequently past the first third of the book.