Jiangmen Shuijie is not Shuinan Street.
Water Street is what old Jiangmen people call a market behind Jiangmen Dizhong Road, Kwai Wei Road and beside Taiping Road, because there is a market called "Water Street Farmers' Market".
Water Street is a market with a long history. Because it is in the oldest urban area of Jiangmen, it is difficult for cars to enter, so customers are basically economical, so the food sold in this market is relatively cheap.
You can take the Jiangmen Dizhong Road and turn at the Diaotai intersection.