I'm not sure about Dan bringing her coffee but in 1x02 Serena showed up to Blair's with two bone-dry cappuccinos and in 2x23 also it's 说 in regard to Serena that: "She's not a morning person but 显示 up with a bone-dry cappuccino, she'll follow 你 anywhere." So I presume she primarily drinks bone-dry 锦标 :) hope this helps x
