1. Slang alert. This version has an unfortunate collision with English slang.
2. "into" is correct. The word is a preposition indicating movement to the interior.
3. "in to" is incorrect. These words may appear adjacent to each other, but semantically they aren't attracted to each other. "In" will be part of the verb, e.g., of a radio station: "(Tune in) to our news program.