You have to squeeze the ball with your hands. if its hard to do that. Bounce the ball on the ground. If it bounces up to like 3 or 4 feet up in the air when you just drop it. Then you have enough air.
you have to use a ball pump. most likely you would get them at reble sports or mabey even at a 2 dollar shop or saint vincents de paul
you should call a professinol to fill it up. if you don't want to fill it up with dirt
You should get your basketball coach a Basketball because they love Basketball
There are several methods for filling a basketball with water. One method involves carefully removing the plug from the inflation hole in the ball. Filling the ball, replacing the plug, and taping the entire ball to prevent leakage.
Fill it back up?
When the engine is cold it should be up to the cold fill mark