A word of caution on evergreens.... Please be careful to make sure it is a pine tree, as some varieties of evergreens are not meant for human consumption.
Also - whenever I do yard work trimming up my evergreen trees and shrubs I get raised red bumps on my arms where the plant material has brushed up against them, so I am pretty sure I have allergies to them. (I consider it an allergy prick test at home) ;) so I personally wouldn't drink Pine needle tea because of allergy concerns.
Just a couple of thoughts. :-)