And WDW, how many swimsuits would you bring?

We don't normally go to the pool that often, so I only have two suits personally. But, I will clearly need more than that for this trip. I also wonder how many the kids should have? I know when we went on vacay last year to a water park that it was good to have 3 and that was only for a week. How many would you bring? We will have laundry facilities for the first 7 days and then not again until the last seven days (so a 10 day gap in between laundry possibilities, though I'm sure we could pay at a laundromat or something). TIA!