There are several types of fasting. The one you choose is between you and God. He will honor your best sacrifice.
Drink only liquids (you establish the number of days).
The Daniel Fast
Eat no meat, no sweets and no bread. Drink water and juice. Eat fruits and vegetables.
This fast can be a Full Fast, Daniel Fast or give up at least one item of food.
A partial fast is from 6:00 am to 3:00 pm or from sun up to sundown. You can select from three types of fasting —a Full Fast, Daniel Fast or give up at least one item of food.
Teach your family about fasting. Here is a great article from Lifeway.
What is a fast and why should I do it? by Leighann McCoy, with excerpt from Jack Hayford's "It's Time to Fast"