HELP!! Meeting up for a drink, but I'm not a big drinker!

Okay I know this sounds silly, but I'm meeting up with a guy this weekend for a drink, but the thing is I'm not a big drinker, and when I do drink, it gets to me fast. So can anyone recommend something for me to order, nothing too strong?
HELP!! Meeting up for a drink, but I'm not a big drinker!
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