I too drink lots of fluids before a blood draw, and that helps.
Another tip: Notice where they most often find a good vein. Chances are it'll be the same place most of the time. Then tell the nurse or blood draw technician ahead of time, rather than letting them hunt and poke in the wrong place.
For some reason, my left arm has much better veins than my right arm, even though I'm right-handed, so I've learned to tell them to look there.
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