How much water is a glass of water?

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When diets say for example to have eight glasses a day, how much liquid is a glass? I had two bottles last night (handbag sized). Is that two glasses or more?

Good question.

Our glasses are I think 1/2 pint.

I think a small bottle of water is 500ml, which is over half a pint?

So, for this purpose I would call each small bottle a glass.

I think 250 mls...

total of around 2 litres per day