It's pretty obvious that no Bible verses actually SAY any of that. It was what vpw called "private interpretation."
If I were to go strictly by what's in the Bible, and refused to guess, I'd have to make the following conclusions.
1) The presence of the spirit would make fruit of the spirit possible.
2) Nothing is said to be required for them otherwise- no practice, doctrine, etc. So, the "you have to" anything thing is all personal opinion.
3) Strictly speaking, walking by the written revelation isn't required either. If you do right but don't know which verse says to do the specific behavior, it doesn't undo what you did.
4) As if it needs rephrasing and repeating, neither manifestations nor gifts of the spirit are required.
5) Nothing said that the ONLY way to demonstrate any of those is by fruit of the spirit. People can acquire those elsewhere, with varying degrees of success. There's non-Christians who are confident they've achieved "peace", and probably have. But having the spirit would sure make it a lot easier, by way of the fruit of the spirit.