Now, just a word beforehand tea isn't beneficial to all Bettas, some react nicely and some react to tea in a bad way.
IALs are Indian Almond Leaves, they're dried up and look like this
! It's pretty hard to get hands on these.
Since a lot of us cannot get our hands on IALs, some people use green tea, and other types of tea. Make sure the tea is just simply tea no other additives and that it's caffeine free. The ingredients list on the tea should just ex. "green tea".
I would check the Roobios Teas before buying it, I prefer Stash though.