Make sure it IS cracked, because I am really doubting that it is. Unless it has gotten into an accident (eg. . car hit on drivers side fender real hard), I couldn't see it cracking. Now, it might be, but let me get to the obvious causes and you check those out. My first instincts would be to check the washer fluid line connected to the bottom of the washer reservoir. If that thing comes off, it will all drain out right away. Also it could be where the fluid pump is connected.
just in case it is cracked, it's easy to replace. You DONT have to remove the fender. Just remove the drivers side fender splash shield. Then get under it. There are only about 3 - 4 bolts holding it down. After removing bolts, just pull it out, it will pull out the slot that goes through the inner fender.