for me it's iced tea.
not the sickeningly sweet, chemical tasting stuff that comes in a can or bottle from nestea, lipton, or snapple (although i still drink those if i can get a half glass of ice water to cut it down), but real brewed rea that is then cooled and iced.
i especially like when we go to a restaurant that has real brewed iced tea. sometimes, you can tell it's simply chinese black tea, or just plain ol' lipton or barry's tea bags, but a good, homemade iced tea is a delight to me.
in nomine patri, et fili, et spiritus sancti.
Meh nom eh noh...doot dooooo do do do.