In a medium saucepan, bring 4 cups water to a gentle simmer. Remove from heat and stir in tea bags. Cover and let steep 15 minutes; remove and discard tea bags.
Add milk, oats, and salt to pan and bring to a boil over medium-high heat. Reduce heat and simmer, stirring occasionally, until oats are tender and mixture is thick and creamy, 20 to 25 minutes. Remove from heat; stir in brown sugar, orange zest, cinnamon, and nutmeg. Serve with plums, blueberries, almonds, more milk, and a drizzle of maple syrup.