I have always, always been interested in astral travel but have never been fully successful - at least not during my actual attempts while awake! I remember being a young teen and learning about astral projection. I would go to my room to take a nap just so I could try to astral project. I always fell asleep though 
but maybe one day I’ll be able to consciously shift into the astral!
I’m not sure of a tea recipe but @Mistress_Of_Herbs has an astral travel spell oil recipe! You can find it here → Astral travel oil