Where does fresh water come from after the flood?
During the hydrologic cycle, only water evaporates. Not the salt. So over a period of time, the fresh water run off fills our lakes, rivers, streams etc...
This run off is not only from rain, but melting snow as well.
If salt evaporated with the water, and rained back down upon the earth. It would eventually kill most all the plants. And there would be no fresh water to drink for the animals, so they would die also.
So it was the hydrologic cycle that made the fresh water. Which by the way, before the flood did not exist because there was no rain.
Yet with the recession of the flood waters, the lakes would remain filled with salt water and be undrinkable even with the addition of more fresh water. Since evaporation doesn't dry up a lake, then the lakes today should not be fresh water but salt water.