Housing And Equipment
When it comes to housing bettas there are lots of options that you have. So that's why here I will tell you a some of the options that you have when it comes to housing bettas.

 
 
Tanks
Tanks in my opinion are the best when it comes to housing bettas. Although it is a lot more expensive if you have a lot of bettas. But if you only have a few bettas I really recommend using a tank to house your betta (s). Tanks range from 2 1/2 gallons to over 60 gallons. Use 2 1/2 gallon tanks if you want to house one male betta, or to house 2 or 3 females. Remember that male bettas cannot be put together or they will fight to the death. Just do a weekly water change if you use 2 and 5 gallon tanks. Tanks 5 gallon and up should have heaters and tanks 10 gallon and over should have some sort of filter. Air pumps aren't really needed.

Tips:

  • Don't use gravel or sand, it makes cleaning much easier without them.
  • Add in a live plant, it helps out and plus it makes the tank more interesting.
  • Buy a gravel cleaner where you can siphon out the water while cleaning the gravel as well. They only cost about 4 dollars for a 5 gallon cleaner.
  • Don't put the tank in direct sunlight to reduce algae growth.

Here are some examples of tanks you can use.

'Tanks of these size can be used to house a couple of female bettas.

5 gallon tanks such as this one can be used to house a single male or a couple of females.

Hexagonal tanks such as these can be used to house a couple of females and a single male. But they are not as good as rectangular tanks, since these kind of tanks make it harder for the betta to get air ( if the water is filled to the top). But they are still better than jars or goldfish bowls.

This tank would be around a 2 1/2 gallon and can be used to house a single male or 2-3 females.

 
jars
If you have a lot of bettas than this is probably the best option you have. Jars ranging from the size of a pickle jar to larger jars can be used. But if you ask me I use jars that are at least half a quart. Change the water every at least two times a week..

Tips:

  • Don't use gravel or sand to make cleaning easier.
  • Don't put the jars in direct sunlight.
  • Don't put in any heaters, filters, or air pumps.
 
Community Tanks
Community tanks should be one of your last options if you have males. But if you have females than it would be a lot better than jars. Just be sure to have at least 2 females put together...it will keep them happier. I recommend putting only male in a community tank. Since community tanks are well filtered already you can just do partial water changes every week and do a full water change every month or so.

Tips:

  • I've got basically the same tips I have for tanks. But be sure to use gravels, sands and plants. Since there are other types of fishes.