RE: Thai Iced Tea
I lived in Thailand for 3 months, and had a Thai next door neighboor restraunteerfor 7 years. She showed me how to make a lot of Thai food, including Thai tea and Thai coffee.
The tea is pretty regional as far as what tea they use and additional things added in. But nearly all you find in US Thai resturaunts is brewed with a Black Tea variety, strongly brewed, and sweetened with sugar and condensed milk, served ice cold on ice with a final pour of whole milk over the top that's not stirred in. When asked "How much sugar, sweetened condensed milk" she'd reply "what you like" and I never did get anything exact. It looked to be about 1 TBS sugar, 1 TBS condensed milk per glass, then literally just a splash of whole milk over the top. Always whole milk.
She'd talk serious smack about skim milk.
Also, some area's of Thailand will make it with star anise or tamarand added in. The star anise is interesting, didn't care for the tamarind in the tea.