I have a basic health question that I honestly don't know the answer to?

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So Tuesday is my birthday and I will be going to the buffet with friends since I eat free on my birthday. The problem is that on Wednesday morning I have a health test and I am not allowed to drink any water for 9-10 hours before my test. I want to know which buffet is the least likely to dehydrate me before my health test on Wednesday because I need to drink water constantly and might be diabetic. All of these restaurants allow you to eat free on your birthday so I can choose any one of them. Here are my choices

a) a chinese buffet that serves chinese food
b) a chinese buffet that serves americanized chinese food
c) a japanese sushi buffet that serves sashimi
d) a greek buffet that serves greek dressings, flavours, salads, olives, meats etc...

Right now the most appealing choice are the two chinese buffets and the greek buffets

What do you think I should do for my birthday?
I have a basic health question that I honestly don't know the answer to?
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