Wow, that's extremely impressive if you fasted for 18 days on just water.
Did you drink any juice? Take any herbs or essential oils?
If not, you must be in a really good state of health and have fantastic will-power.
I find it amazing that with such a focus on fasting in the Bible and fasting being taught by most of the major religions of the world, that very few Christians ever attempt to fast. So congratulations to you!
I haven't felt drawn to Water Fasting but I fast on fruit juices regularly.