Hello!
If milk is causing acidity or the taste is not appealing to you, please avoid taking milk. You can take curd, paneer, buttermilk - these have better nutritional benefits than plain milk.
Adding tea/ coffee/ bournvita does interfere with milk properties, but it’s not harmful. Since tea does not require lot of milk to be added, there’s no benefits of milk that you get with tea.
Buffalo milk is easier to digest than cow milk, but fat content is high . You can take whichever is available, but always boil or well before using.
Health Tips
Avoid taking any medication or supplement without expert advice or prescription