The amount of water you need to cook pasta depends on the quantity of pasta you are cooking and your personal preference. As a general guideline, you'll typically want to use about 4 to 6 quarts (3.8 to 5.7 liters) of water for every pound (450 grams) of pasta. This amount of water allows the pasta to cook evenly and prevents it from sticking together.
Make sure to use a large pot to accommodate the water and pasta comfortably. Also, adding a tablespoon of salt to the water can enhance the pasta's flavor.
Remember that the cooking time and specific instructions may vary depending on the type and brand of pasta, so it's always a good idea to check the package instructions for the recommended cooking time.