Depending on your family size simply buy the amount of ingredients that you need.
Make sure your ingredients are fresh and nothing added. Simple bagged carrots, potatoes and fresh chicken. If you like a lot of carrots, add a lot of carrots, if you like potatoes, add the amount you lke. The amount of the ingredients are just how many you are cooking for.
Wash and prepare your chicken, if the chicken you have purchased has the skin simply remove the skin before cooking to reduce the fat.
Pour a couple of tablespoons olive oil in the bottom of a large pot. Place washed chicken in the pot and season as you like.
Sear the chicken on both sides then add enough water to the pot to cover the chicken. Boil the chicken until tender and falling apart. You may have to add water during cooking, keep the chicken covered with water. It usually takes the chicken about an hour and 15 minutes to cook, sometimes a little longer or shorter. What you are looking for is the chicken to be tender and falling apart.