I hear water , running back and forth in or rear of the driver seat of the extended cab area
If some one could tell me where could be the water and how does it get in and
how could I get rid of the water.
Do you see water or are you hearing gas sloshing around in the tank?
I hear water and some water comes to under my seat
Like FoR said, that's where the gas tank is on a Mazda pickup. The noise might have always been there (baffles will try to limit the sloshing) but you might have lost some sound insulation in the cab over the years.
Well that changes my answer then, you may have a leak in your cab then and water is pooling in the floor pan area
Clean the water up and check all the door and window seals and also the door drains.
Rags and paper towels should work for clean up. You may want to pull up the carpet though.
I will take the floor carpet out to see where the water is coming from, and then will post all I learn from this. Thanks to all you have input to this . Thanks to you all again
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