Have you considered making a diluted bleach solution? Day cares and moms make this up to sanitize toys, and surfaces.....Then run through dishwasher on hottest cycle. When my husband bottles beer, we wash bottles with that PBW (store upside down), put through dishwasher when ready and bottle. Never had a problem..
However when I bottle my wine, I use that vitners pump thing and put either meta solution or a solution of that sanicleanse, which is "foodsafe", pump into bootles 1-2 pumps, drain back into its reservoir and put on bottle rack. Do you have any of this? If I had neither of these on hand, I would do bleach and dishwasher above ....myself..good luck! I know the feeling of not having, in my case, a well stocked store or no store nearby.