Grip Coasters

Good idea.

From websites:

Brightly colored 3"-diameter Grip Coasters serve as both coasters and drink markers.

They protect surfaces from condensation that forms on cans, bottles, stemware bases, and straight-sided glasses.

The six bold colors will help identify whose drink is whose at your next get-together.

They're smartly designed to fit most cans, bottles, stemware bases, and straight-sided glasses.

Dishwasher-safe silicone.

Set of 6: $2.98.

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Note added 10:37 am Monday, June 5, 2023:

Looks like these coasters suffered a "tragedy of the commons" event once I posted them and promptly sold out.

No worries: if you've really got a bee in your bonnet you can get a set here for $11.99.

u snooz u looze