Females should be kept in at least groups of 4, or singly. There are some females who will tolerate groups of less, but it's best not to risk it. They CAN be as snotty and aggressive as the males.
Technically, if you want a relatively small tank and more than one female, then you can get a 2.5 gallon (I wouldn't recommend any smaller for more than one female), and, either do great filtration, or do 100% water changes at least once a week. Then you can have 4 females together...but, seriously, if you're going to do that, you have to be very good about your water changes, even with good filtration, and you have to provide plenty of hiding places like caves and plants. Again, because some females can be as snotty and aggressive as the males.
Basic care is the same as males. And you can keep ONE in a 1 gallon bowl same as you can a male.
Edit: Even better, though, is about 5-6 females in a 10 gallon tank. With good filtration, a heater, and lots of places to hide. That would be a very ideal setup for females.