From what I'm reading, burning 1 gallon of gasoline produces 8 pounds of water. Strangely, 8 pounds of water is about 1 gallon.
So, burning 1 gallon of gasoline produces 1 gallon of water and about 18 pounds of carbon dioxide.
89 million barrels of oil are consumed each day, and each barrel holds 42 gallons. That's 3,738,000,000 gallons of "new" water created each and every day!
Of course, you're wondering how many olympic-sized swimming pools that would fill, and the answer is 5,664.
IEA - Oil
1 gallon of gasoline · BlueSkyModel
Thermal expansion of the water is another good point to consider.
Even so, I'm not too concerned about sea level rise. There are much more immediate and tragic conditions that humans currently are subjected to that need attention (poverty, famine, war, disease).