you can but if you dont do it right ITS POISONOUS
it is use for preventing diseases such as cancer, stroke and others.
It most likely varys between each location. Many places use lipton but it can be any brand.
of course is seaweed because is a tea made out of seaweed
Of course you can it's actually preferred as a tea for medicinal use. Shamans used it for enlightenment. Read more about how to make salvia tea here:...
Dried herbs steeped in water.