In the copy of hulda's recipe that I have it says no eating or drinking after 2:00.

I have found I can drink water and even a little apple juice right up to the second dose of Epsom Salts and have even better flushes than when I tried the no liquids after 2. I do not drink anything after the second dose of ES because the stomach needs to be empty when you drink the oil and juice mixture. Water in the stomach can trigger nausea and vomiting.
Never drink caffeinated drinks or dairy based drinks on the day you flush, but plenty of water and juices are needed to make sure you will not become overly dehydrated during the Epsom Salt induced bowel flush. Having plenty of fluid in your system actually makes the bowel flush more successful because magnesium based laxatives work by drawing water into the bowels liquefying waste and flushing it out.
After a few flushes you will be able to determine what small adjustments you can make to have the flush work best for you. As long as you keep to the basic elements and timing, everything will work out fine. I am a veteran of over forty flushes, most have been done using the basic Hulda Clark protocol, but I have finessed it to the point where it works better for me. You will eventually be able to do the same to meet your needs.

I think that it would be an absolutely terrible idea not to drink water before and after Epsom Salt coctails. Doing otherwise is incredibly dehydrating and keeping large amounts of water running through your system helps keep flushing out your bowels.

I usually drink multiple liters of water in addition to that which I drink with my Epsom Salts .

Yes! I ALWAYS do. I chase the epson salt cocktail with a glass of water and then drink another glass of water an hour after the first dose of epson salts. I chase the second dose of epson salts with water also. I find I stay hydrated that way and therefore don't get that wiped out feeling.