1. A good bed bug spray is all you need to solve an infestation: FICTION. Bed bug sprays can be a useful tool, but you will need more than that to kill the horde of pests infecting your home. You will likely need to dry-steam your home, as well as spread around diatomaceous earth. The former will destroy bed bug eggs, while the latter will ensure that you have residual protection.
2. You should buy an organic or "natural" bed bug spray: FICTION! Look - we're not trying to bring back DDT or tell you that there is no environmental or human danger from pesticides, but the fact of the matter is that "natural" bed bug sprays simply don't work. Moreover, even if one did work, there is a strong likelihood that it would still be pretty toxic to humans and pets, so the benefits would be minimal.
3. You only need to spray once: FICTION AGAIN! Just because you made an effort to get rid of your bed bug infestation does not mean that the bugs are going to comply. Quite the contrary. Bed bugs can live for months without moving or feeding, so they are likely not going to be out and about during the week or so that your spray is effective. You will need to spray and treat your home again and again to make sure that you've gotten all the critters.
4. Getting started today is essential: FACT! The bed bugs aren't waiting around to bite you or to to reproduce, so if you know that you have a problem, you need to act as soon as possible. Don't wait to see if the problem goes away. We can tell you from experience that it will only get worse and will only cost you more to fix.
