There are only four ingredients, milk, food grade citric acid, rennet and salt. You can probably find the rennet at the food store, but you might have to order the citric acid on-line. The only tools you need, other than the pot and the stove, is an accurate thermometer and some cheesecloth. You mix the milk and citric acid, and heat it up.
Then you mix in the rennet and let it sit for a little while.
Then you strain it through the cheesecloth.
Then there's a little heating and squishing and stretching and heating and squishing and stretching.
Then you eat it. Tomatoes are optional.