1) Do NOT keep them in a freezer. Very cold and very hot is what destroys antibiotics. Otherwise they will likely last 10-15 or so years until get too weak to work.
2) Can purchase at most any pharmacy for about $50. For the best prices, go to www.goodrx.com
3) Most primary care docs will write for them....if you explain your reason and don’t come in for other complaints (takes a lot of time to write and document some problem). Tell them that you are going remote (1 month expedition on a remote boat or wilderness area with no medical in 100’s of miles).
Great ideas and thx for the storage info.