How can I put a simpe search option on my site that seaches everything and displays it in the layout that I want?
Your question is infinitely broad in scope and resulting implementation strategies. It may help the readers if you were to elaborate on the specifics.
If all of your text on the site is listed in a database you can do this yourself (maybe). Alternatively you can use google to do it for you. Try a search of these forums and you get the option to perform the same search again with google, this only works if you have an adsense account though. A simpler way is to have a form that posts a query to google like "site:www.google.co.uk querystring" If you want to customise and host the search results it on your own site without using google it gets harder to do.