I agree with the posts which recommend the building of the community before the disaster and then sharing knowledge after. If you share anything past the first day or so, it should be tools or mechanisms to make them self sufficient or help them contribute to the long term support of the community. Just having a role and some responsibilities will help them and the community. Your preparation will place you in a leadership role, and they will look to you not just for survival knowledge and guidance, but for leadership in general.