This set of dishes and flatware, which could be china dishes, crystal glasses, and silverware, or each of the same out of other fine materials, defeats poison.
Such sets were developed in an era when intrigue and murder combined.
Glasses and bowls neutralize poison and purify water. Some change all liquids to water, while other sets only neutralize poison(s) in the wine.
Food placed on the plates would lose any poisonous effect. Rancid meat would have any foul disease causing bacteria neutralized, but the meat would not become a wholesome affair.
These place setting vary in number from a single setting, to a matched set for any number of places.
More elaborate sets even have cooking vessels to neutralize poison, but that is just an extra precaution.
Less fancy cooking vessels were issues to troops in barracks or on the march. These mostly prevented disease, but also prevented poisoning or drugging by the enemy. Usually, only the officer’s mess had a table service of such magic.
The crunchy bits:
I won’t lay out great detail on the mechanics aspect, but suggest a couple different routes for handling it.
A full set of table service, dishes, cups, utensils, etc. would neutralize poison. The dweomer requires the presence of all pieces for full efficacy. Add +1 for each piece present for the meal for less than a full set. For poisons with no save, it allows a save.
Lesser/Major: A lesser set will only be maximally effective with all pieces for a setting present. A Major set would neutralize all poison and disease to be served on or in any piece.