How do you Fast?

There are many ways to fast. From my reading of God's Chosen Fast by
Arthur Wallis and my discussions with a friend of mine who has fasted
for several weeks at a time, I have learned a few key concepts on how
to fast:

There are 2 main types of fasts:
The normal fast: abstaining from all food, solid or liquid, but not from water.
The partial fast: emphasis on restriction of diet rather than complete
abstention.

"Start with a partial fast, or else fast one day till supper. Next
time extend the fast till retiring, breaking it with just a light meal
or fruit only. When you can manage a one-day fast without feeling
faint or famished, you will be ready for any call of God to a longer
fast of 3, 5 or seven days."-Arthur Wallis

Here are a few notes on different types of fasts:
The simple fast: This is not eating but drinking only water from when
you get up in the morning to sundown i.e. eating only 1 meal in the
day--dinner.
The long fast: This is again drinking only water...but lasting 2 or
more days...from what I have read and learned from others, the first
several days are tough but there is a period just after the first few
days that you gain a hightened awareness of your surroundings and of
God...this usually lasts between day #3 and day #7-10...then true
hunger sets in and can be difficult (like the first few days without
food isn't?)
The modified fasts: My friend who fasted for over 2 weeks ate nothing
and drank only juices and occasionally had soup broth....I also have
friends who have fasted from certain foods: deserts, caffeine, etc.
There are many different ways to fast.

Please also note: I wouldn't recommend fasting for people with certain
medical conditions such as diabetics etc. (check with your doctor)