There's only one obvious way you can think of to save these people from suffering. If you take any other route, they'll only live long enough to see more people they care about die. You know it seems cruel, and it is in a way, but you're only trying to save these people. The poison has some delay, but about midway through the evening, people start dropping. There's a little mild panic, but soon everybody is dead, and there's only you and your unpoisoned wine. You pick it up and take a big gulp as you're watching the last few fade away and...wait, this isn't wine. Well, darn; it seems you picked up the wrong glass in the confusion. You probably know what this means; a couple hours of trying to vomit the substance out, you pass on from this mortal coil.