Royal milk tea was one of my favorite drinks too, it used to put me in a fancy mood whenever I drank it with my friends.
I love "houji tea(roasted green tea)" and "genmai tea with matcha(green tea with toasted rice and powdered green tea)". I think vitamins in green tea actually work because my friend who had a cold said he felt much better after 5~6 cups of genmai tea.
I'm hooked on soy milk now. I can't believe how much I like it, never had it untill a few weeks ago, but it has this natural nutty sweetness that I love!