DELAVAN, Wis. Delavan homeowners and business owners are paying much more for water this year after a large water rate increase took effect on New Year's Day. It's a big change for restaurants that constantly use water to serve and clean up after customers. Delavan estimates homeowners are paying an average of about 60 percent more on their water bills due to the new water rate. The city says the increase, which is Delavan's first full rate incr…