Krandle,
Water was not my beverage of choice before Medifast either. Try having it at different temperatures. Sometimes I can get it down easier if it is hot. Put a squeeze of lemon in it and have it hot or cold. As time goes by, it gets easier to slurp.
Hopefully your body will relax a bit this week, give it a few days to recover and then take some slow walks! We're glad you're here!