We don't normally specify the precise volume in centilitres. In England, we think in pints. When we are on the continent we tend to thinkof a large beer (0.5 or 0,4l) as 'a pint' and a small beer (0,33 or 0.25) as 'half a pint'. So:
I only had half a pint yesterday.
I went for a quick drink after work. I only had a half, as I was driving.
I had a couple of pints at the Slug and Lettuce last night.
I don't feel very bright this morning. I must have had seven pints last night.
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