You can buy an air lock from any home beer making supply company. When we make hot sauce at home I use them for the same reason you need one for a mother vinegar, to keep out fruit flies etc. You can see mine at the top of the bottle. It has water in it and allows air out but nothing can get past the water and get into your vinegar.
You can buy one online from NORTHERN BREWER
. Just put "air lock" in the search box. I think they cost about a dollar.
The Hot sauce as pictured above can be made as follows:
Since the size of peppers etc vary I create recipes by weight. I use my postal scale.
6 oz Habanero Peppers, stems removed
1 Pineapple, skinned and core removed
3 oz. Japones Chilis, stemmed removed and re-hydrated for 1 hour
2 Tablespoons Molasses
4 oz. Salt, liquid measure
2 Tablespoons Thyme
1 Tablespoon Cracked Allspice
1/3 cup Packed Brown Sugar
2 cups vinegar
Grind up the peppers with the pineapple and mix in everything else. Let sit in a clean jar with an air lock for a month or longer shaking every couple to 4 days. This recipe varies depending on what I can get fresh but basically this is it. It is fairly hot and you can adjust the thickness by adding more vinegar.