Emergency essentials has a lot of per piece medical stuff for FAKs - I believe they have iodine wipes as well as other types of antisceptic wipes. They have a wide variety of single use first aid items.

Emergency Essentials

Gerber bags fit in all my kits. Another possibility are the MRE hot beverage bags, though those are a bit bigger and I doubt if the seal is as good as on the breast milk bags.
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