In a large pot over high heat, bring 6 cups water to a boil. Remove from the heat and add the tea bags. Steep for 10 minutes, remove the tea bags, and let cool. Pour into a clean container and chill.
Fill 4 tall glasses with ice. Pour the tea three-quarters of the way up and top each with sweetened condensed milk. Serve garnished with an orange slice. For the adults, top with vodka.