Store it in the room housing your betta so its temperature is the same as the bettas jar. It makes it safer when you change his water. If you only have one betta, bottled water might be a good way to go. For those of us who are way past 50 bettas, bottled water is not even an option.
The average person litters 4.4 pounds a day. 29 pounds a week. And 1,600 pounds a year! That is enough to cover Texas 2.5 times.
Litter ranges from 1-8 kittens - average is 4-5. No way to tell how many she has based on past litters or the size of the litter the male and female came from. Be sure the male is neutered now - he can breed her while she is nursing. It really depends on the cat.