Question about regrouting bathroom tile?

The shower in our master bathroom started to leak water out onto our carpet about a year ago (we quit using it and it's been dry since) I examined the tile grout and found many cracks and places where the grout came out from between the tiles. My question is how big a job is it to regrout the tile? I'm trying to keep the cost of this repair down as in about 5 years I would like to completely remodel the bathroom but just don't have the money at this time to do it right. Do you think regrouting will solve the problem? Thanks