How do these work? Are they like the equivalent of the cups that Bettas are usually sold in?
To answer your question, I have to spend some time and give you a little bit of background.
Breeding bettas involve a bunch of steps, but basically, these are the main:
1-pre-conditioning: that's when you feed the male and female with special diet, raise the temperature and add almond leaves to prepare them to mate;
2-conditioning: that's when you let male and female see each other. Male will reduce aggressiveness, start to make a bubble nest and female will start to get ready from a biological perspective;
3-mating: if the male doesn't kill the female, they will mate and collectively place the eggs inside air bubbles from the male nest;
4-population control: as soon as the female is done with her initial role, she will turn aggressive and starts to eat some eggs. Female needs to be removed;
5-week 1: after hatched, fry has tiny small mouth, and during this time special, almost microscopic diet is required. Feeding must me often but controled, otherwise the stomach disdends, generating an atrophy of swim bladder. Father goes into population control mode and must be removed as well or will also eat fry;
6-week 2: swim bladder issues continue, feeding must be done every 3 or 4 hours;
7-week 3 and 4: betta fry becomes normal fry. Regular carnivorous diet can be introduced, some culling starts to take place (the deformed, the ugly, the small and the slow are all removed)
8-week 5: females form seroroties, and males start to develop territorial behavior. Females are removed to 10g tanks (groups of 5), aggressive males are "jar'ed".
The tequila bottles you see are low profile glass bottles that will be used to jar my "generic" males. These are the ones that survived cullings but are not receiving special treatment. They will be gifts, trades or sold for $1 to $5. I expect aproximately 20 to 50 of these, so I want 100 jars to have a rotation on cleaning and conditioning the water. They have enough volume to allow 24hrs without water changes, are low profile in one dimension (making life easy to photograph) and come with a good price tag: FREE!
I also expect 3-5% of the entire process to be very good fish. These are the "champions", and will be raised on heated tanks with almond leaves' extract. I expect to keep one female for F2 with the father, one male for tank 3 of my triple aquascape and (if any left) sell the remaining ones for $15 females and $40+ males.
If the overall experience ends up being positive, I will attempt F2 with the same father and the best female from the set before weather gets cold again in FL (late september).