a point of grammar

[Unregistered]

Is there a difference between:
To go to America, you need a visa
and
For going to America, you need a visa.

To kill the bacteria, boil the water for 10 minutes
and
For killing the bacteria, boil the water for 10 minutes.
Is this just a matter of style or is one of the them incorrect or is there a difference in meaning between the two?

[Soup]

To go to America, you need a visa.
For going to America, you need a visa.

To kill the bacteria, boil the water for 10 minutes.
For killing the bacteria, boil the water for 10 minutes.