can fruit flies get inside? this is a big problem in my kitchen right now

No they cant also buy a indoor bug zapper from Amazon and you will have no more fruit flies or any other.

What do they mean by add half of water to the airlock? do they mean fill it up halfway with water?

Save yourself the time and don't buy these. They don't seal properly.

Can these be used to further ferment commercially bought fermented foods by replacing the lid?

Yes, you can continue to ferment commercially bought fermented foods, if the food has not been pasteurized. It may say “live active cultures” on the food label.

Manufacturer	Klemon
Item Weight	408 g
Product Dimensions	13.97 x 13.21 x 0.25 cm; 408 g
Size	Stainless Steel Fermenting Lids
Color	Clear
Style	Can,Jar
Material	Silicone, Stainless Steel
Shape	Round
Number Of Pieces	3
Batteries Included?	No
Batteries Required?	No

Fermentation Lids, 6 Set Fermentation Kit for Wide Mouth Jars, 6 Stainless Steel Fermenting Lids with 24 Silicone Grommets, 6 Airlocks, 6 Silicone Rings(Jars Not Included)

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