You are not suppose to have milk at all. You can have milk in the week where you have to have a break.
Black tea and coffee BUT you can use tablet sweetner! I am finding black tea with sweetner is really nice. Black coffee I am used to now! Also you can have peppermint tea, green tea, redbush tea and earl grey. Anything that is from a leaf- so no fruit teas or anything "with honey".
If you still cannot stand it try Buillon. You can have two teaspoons of that a day and it makes a lovely savoury drink!
Jem x