kefir.net is the website
You best bet is to get "kefir grains" which act as a starter. Find milk grains for milk kefir and water grains for a juice-like kefir drink. The grains are widely available online for purchase. You...
There are no benefits, only disadvantages. Wait till you are of legal age.
more likely to get laid
#1No, unless you count enamel erosion as a benefit.