Pour 2 cups of water into a pan. Bring the water to a boil.
Add 2 tbsp. flaxseed to the boiling water. Place the temperature on medium-low. Leave the pan uncovered. Boil for 10 minutes. The oil will start to accumulate at the top of the water.
Remove the pan from the heat. Set aside and allow the pan to cool.
Cover a bowl with a piece of cheesecloth. Pour the contents through the cheesecloth to strain the flaxseed oil. Use your hands to bunch up the cheesecloth to form a pouch. Grab the top of the pouch and squeeze. Slide your hand down the cheesecloth, while squeezing, to release the flaxseed oil into the bowl.
Pour the flaxseed oil into a plastic bottle or a sealed glass container. Store the container in the refrigerator for up to 10 days. Ensure the lid is tightly sealed. Flaxseed oil can turn rancid very quickly. After 10 days, discard the flaxseed oil and make a fresh batch.