You can check the wiki for that. The 3 non-unique flask should drop from anywhere

For taste of hate : https://www.poewiki.net/wiki/Taste_of_Hate the flask can drop from anywhere but with a low chance. You can also try using orbs of chance on a sapphire flask (then scour if not unique). This also has a low chance of giving you what you need. Last way you could go to farm it is to look at the recipes, the div card ”The Hunger” reward you with a taste of hate, and those can be farmed as they only drop in certain areas (check wiki for areas).

For the overflowing chalices i don’t think there is any good way to farm it, but given i get several every league i don’t think it’s a rare unique flask?