Go to 99 Ranch Market to stock up.
Ask for "Haidilao (海底撈) spicy hot pot". It comes in a bag. For a non-spicy soup base, you can also ask for a tomato flavored Haidilao (海底撈) brand soup base.
On a stove, pour the hot pot base into a pot and heat it up until it sizzles a bit, then add water until the pot is maybe 3/4ths full. Toss some whole garlic cloves and the white halves of green onions in there.