Firstly, we will shortly be releasing a solution for non-wordpress websites that may work for you.
It will provide the same Waiter plugin, that helps you write great posts frequently and syndicate them through the soup, but without publishing on your own site. Although this is intended for people that have just built their own on another platform (for instance in Wix) and are happy for posts not to appear on that site.
As for the <div etc, If you are talking about the Create Post screen of the Waiter plugin, is it possible you pasted the contents in? If you paste HTML content in the WordPress editor, you must paste it in text mode, if you paste it in Visual mode you will get the results you describe.
I hope this helps,