The best thing to do would be to hire a lawyer. It will be worth the investment. On your own, you will not be able to properly litigate a matter, especially if the plaintiff has an attorney.
There is no one universal "form" demurrer. You will have to make legal arguments to the court explaining why the complaint is subject to demurrer. If you are being sued, you should seriously consider hiring a lawyer to properly defend yourself.
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Demurrers are almost always optional.
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I cannot think of any situation where buying a demurrer online would be good idea. Demurrers are seldom granted, and if granted, they are usually not dispositive of the entire action. Additionally, a demurrer is a very pleading and case specific motion. You really need an attorney to prepare this for you.