Combine oats, milk, water, salt, and cinnamon in a medium saucepan. Bring to a boil, then reduce heat to low. Simmer uncovered for 15 to 20 minutes until desired thickness, stirring occasionally. Remove from heat and let cool slightly. Divide equally between four bowls. Drizzle each serving with 1/2 teaspoon honey. Add additional desired toppings and serve.