I have water kefir grains and I'm new to this but it seems like I have more than what I need so I am willing to share them. The person who sent them to me dehydrated them and just mailed them in an envelope so that is probably what works best. They are of no cost to me so they will be free unless I need to cover postage/packaging (if it's really just an envelop and a 37 cent stamp that's fine by me), I just ask for you to share them as well once you're comfortable with the grains and have a surplus.
New Haven, CT United States of America