No, there is no such thing as a temporary will: there are only wills, which are permanent until and unless changeed. You can draw up (and must have properly signed and witnessed!) a new will replacing the old one, but then to put the old will back in force, will need to have a "newer" will created--which can be 100% identical to the current one--and properly signed and executed. That is, you can replace a will as often as you like, but each replacement is now THE will until it in turn is replaced.