You can start a repipe and cut over this winter to the new pipe if it gets really bad.
We used to do repipes this way in commercial applications when we could not shut water down for extended periods of time.
This will only work if you have a place to run the pipe however. On a slab home, this can be difficult, as you will have to open some walls.
In a home with a basement or crawl space, this might be an ideal way to get ahead of the weather. Running new lines and waiting for a nice Indian Summer day to make the change over.
As far as repairing the galvanized, there are repair clamps that are 1/2 circle or full circle that can be used on any bad leakers. I'd hesitate to start any repairs that requires much disturbance to the pipes, like cutting them unless you're prepared to get very involved. Old galvanized pipe can be quite fragile.
Do a Google Image search for repair clamp plumbing for a picture of what to use.