Peter,
There is no restrictions on drinking tea or coffee with diabetes, unless you have any other medical reason not to. As Catherine states, if you are a strict carb counter and like your coffee milky, you may have to include this in your daily allowance. I carb count and drink around 8 mugs a day, but I only like a splash of milk, so don't include this in my allowance. Tea and coffee can make up part of your daily fluid requirement, but you are better to still drink at least 4-5 glasses of water a day.
I can't recommend fruit juice, I just drink sugar-free squash, but just read the nutritional info on packs/bottles for the carb content of the fruit juice.
Nigel