The phrase "small bowl with a fork" is an idiom that means something is easy or simple to do. It implies that the task at hand requires minimal effort and can be completed quickly using basic tools or resources.
Whisk together ground flaxseed with water in a small bowl with a fork and let it sit for a few minutes until an gel like consistency forms. (eatingbirdfood.com)
Heat the oven to 400 degrees F. Beat the egg and water in a small bowl with a fork. (recipelion.com)