Anyway. Event time!
Starting now and ending on Wednesday, characters in Kiseki will be affected by water the same way they would be affected by alcohol. This goes for water in any form - be it tap water, water found in beverages and food. Even that in people's bodies, although a character can't be affected by the water in their own body.
The higher the percentage of water, the least effect it has - so a glass of water or juice probably won't provoke a huge reaction, but eating a sandwich might do so. There won't be any differences in taste, though, so have fun trying to figure it out.
It will work in intervals, as well, and characters affected only will be during certain periods of time throughout the day - it's up to you entirely just how often or not you wish your chara to get affected, if at all.
And as a sort of decoration, there will be (perfectly clean) empty bottles of various alcoholic drinks, corks and caps scattered all over the islands, even inside buildings.
That's all! As always, feel free to ask any questions o/