There are several synonyms that can be used to express the idea of "nothing to it." One way to convey the same meaning is to use the phrase "a piece of cake," which suggests that something is very easy to accomplish. Another option is to use the phrase "child's play," which similarly emphasizes that a task is very easy and straightforward. Other options include "simple as pie," "effortless," and "a breeze." Ultimately, these synonyms all convey the idea that something is very easy to do, and can be used interchangeably with "nothing to it" in a variety of contexts.