Is true that Nestlé Group own the main water resources worldwide?

They most likely don%26#039;t own -all- of the -main- resources, but there is such thing as privatization, so they may own some in 3rd World Countries that are barely coming into their Industrial Ages.

well they own a lot of stuff, but I don%26#039;t think that could be possible.

No, but they do own a few :)