Whatever's cheap and slightly conical – most will do. Worst case you let it sit for ~1h so it melts a little. From 10 seconds of Googling, something like this:

Whatever's cheap and slightly conical – most will do. Worst case you let it sit for ~1h so it melts a little. From 10 seconds of Googling, something like this: https://browzefactory.com/products/tumbler-stainless-steel-20oz?variant=43298715926753 https://browzefactory.com/products/tumbler-stainless-steel-2...