Get to the point in the first level in original mode, where the boy runs out the door with the Johnnys chasing him. After that, there are Davids that jump down from the bridge. Use a grenade (only) to blow open the door behind the David to the left. A grandmother will come out and give you a Bullet Blow, Grenade and other items (depending on how many times original mode has been completed).
In the beginning of the game after the women tells you to save the man, there will be a bucket behind him. Shoot the bucket and a Credit +2 will be sitting in the well.