Sitting at a bar for an hour or so and only ordering a few cokes?

I need to put myself out there more and do something besides online dating. I don't usually go to a bar alone, but in my experience they don't usually charge for non alcoholic beverages. I think it's due to that designated driver thing. Anyways, is it a problem after a while if I start going pretty often. If they don't charge me I'm just going to tip the bartender like 10 bucks to still make it worth their while for their efforts. Opinions?

Sitting at a bar for an hour or so and only ordering a few cokes?
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