I recommend douwe egberts coffee - really tasty and instant so no grinding or performance required :-)
But would also say if suffering with anxiety try not to drink too much coffee, stick to around 2-3 coffees a day depending on your sensitivity as caffeine in large doses creates anxiety like symptoms and can make anxiety worse. (When mines playing up I reduce my intake and substitute some with de-decaffeinated (douwe egberts de-caff tastes the same)
Other than that I'm addicted to pukka teas! Even found one that does seem to help me sleep :-) xx