New answers tagged meat-and-milk
It's just a good practice as often kids may touch the ketchup bottle to the hamburger/pizza/mac&cheese when spreading ketchup on it, or their hands are messy. Stuff like that. (Especially if they have two refrigerators, you keep a bottle in each!) Shulchan Aruch talks about separate salt cellars, but that's because people would dip their bread, cheese, ...
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