Wishful thinking
Sorry Robert, but on a planet with an average atmospheric density of less than 7 millibars, and average temperature of about minus 70 degrees fahrenheit and an atmospherethat is 10,000 times drier than the earth's, you are not going to find small ponds of liquid water.
Even salt water evaporates, and without a source of regular replenishment, even the briniest of ponds will turnb into a salt flat.
Please keep in mind that MARSIS has yet to find liquid water acquifers. And, Mars Odyssey has yet to find evidence of extant hydrothermal activity.