Hulda Clark s is fine you don't need the supplements she mentions. People only add drinking 1 quart of organic apple juice per day 3-6 days (depending which protocol you read)before the flush
for softening the contents of the liver.
The experience from the Liver-Flush forum is that it is important to drink enough water, even after 2 pm up till 20 min before and again 20 min after the ES. The water drinking is from Andreas Moritz 's protocol. A lot of people were getting dehydrated and nausea before.
If you get easily nauseous it is possible to put some ginger in the OO/GFJ or you can follow Dr.Kelley's suggestion (see under cleanses) and have a glass of water with Alka Seltzer Gold (no aspirin)next to your bed and you drink some if you need it.