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That's impossible to really know. You are unlikely to find out without extensive testing on bunny rabbits and mice etc. The chances are stuff used for Airfix models and the like may be safe but then they're not designed for heat or rattling against teeth and the like. If the surface is good enough and you can scrounge like a champion a local plating firm might chuck it in with something else they're doing. Et voilĂ a chromed tumbler - much cooler.
This all depends on there being a local platers and you prostituting yourself.
Are enamel paints toxic when dry?
I've made a little steel tumbler and want to paint it, I have enamel paints in various colours but I don't really want to poison anyone...