Denise-
 you asked about too much fluid inhibiting milk production:
See:  Lawrence,(fourth ed.)  page 287: "No data support the assumption
that increasing fluid intake will increase milk volume.
Conversely, restricting fluids has not been shown to decrease
 milk volume.  Forcing fluids, on the other hand, has been shown by
Dusdieker et al to negatively affect milk production in a controlled
crossover design study of breastfeeding mothers.  Thus, women taking
excesssive fluids produced less milk, suggesting that drinking to thirst
and
heeding body cues is more physiologic than perscribing a specific amount
of fluid a day.  (There is more- about a second study which found
similar results, where one group drank an average of 69 oz daily "to
thirst" and another group forced an average of 107 oz and produced less
milk and had babies that gained less well.)

Sue Jacoby, IBCLC