MakerBot 1.75mm PLA Filament (12 Colors)

So does this filament fit other printers? Is it water soluble?

Yes, any printer with a hot end designed for 1.75mm will be able to use this. PLA is not water soluble, but HIPS is Limonene soluble which is about as close as you can get I believe.

Not so much a deal.
1kg of 1.75mm PLA is usually $20.