Please help me identify a movie referred by an acquaintance. (I haven't watched it.) No cast or director info is available.
The protagonist is today's average man who participates in a scientific experiment with a time machine and lands into the future. The people in this timeline have mentally degraded due to TV addiction, their top IQ is about 80, average is 40-50. They still use technology, but have no idea how it works. They use sweet carbonated drinks for watering their crops, because they believe it is beneficial. The protagonist explains them that they should use plain water for that. When they see that it works out, they elect him as their president. At some point, they want him to solve some problem with a nuclear reactor, and ask if they should water it as well.