There is no quick-fix when it comes to repairing problems that are water related. (As I just wrote to another poster, remember the story about the Dutch kid and the leaky dike??? Use that as a guide to quick-fixes ...)
Find out HOW the water is getting into the crack. Do you have the wrong slopage outside the foundation? Are you missing gutters or downspouts, or are they incorrectly hung? Is the water running OVER or BEHIND the gutter when it rains? Do you have dripedge installed? Are the downspouts carring water at least 3' from the foundation?
Water issues are BEST-addressed OUTSIDE the structure. If you address it from the inside, well, it's already inside. Water can do AMAZING damage even when it's under a little pressure.
My best to ya and hope this helps.
Jay J -Moderator
PS: God Bless America!