Is "lemonade" countable or uncountable? Could I say the following sentence?

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> Could you please bring me a lemonade? 
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Or *must* I say "a glass of lemonade" ?
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"Lemonade" is usually uncountable, but it can be used as a countable noun to mean "a glass of lemonade". It is uncommon, but possible, to treat "lemonade" as a countable noun.

This applies not only to lemonade but to most beverages.
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> Or must I say "a glass of lemonade" ?
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You don't need to. 

From Collins

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> A glass of lemonade can be referred to as *a lemonade*. Example: I'm going to get you a lemonade.
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Take a look at the following Q and A. 

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> *What can I get you?*
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> * A diet coke, please!
> * A can of diet coke, please!
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They are both idiomatic. The "a can" or "a glass" is implied.