OTTAWA — City commissioners moved forward to sell bonds for improvements the city’s water system. They placed the bond sale on the agenda Monday for the next regular meeting for a vote. City manager Richard Niensted said the $2.3 million general-obligation bond issue would be used to build a new water tower, a new 16-inch water line and pump station. The city should receive good bids from financial companies because the city’s bonds are rated by Moody’s.