Right outside of Tesco Lotus is a Cha Payom kiosk. And I saw them all over Bangkok. As you can see, they serve a variety of drinks. I tried the iced coffee, Thai tea with milk and my favorite, pink milk, which really is just a flavored syrup and probably a bit of condensed milk added to milk and poured over ice. When it got hot - and it did - I really wanted sugary drinks for some reason.