"Go through fire and water" is an idiomatic expression used for describing someone who is willing to face any challenge or obstacle in their path. This phrase has many synonyms, including "endure extreme hardship," "brave the elements," "survive tough situations," or "overcome obstacles." Another similar phrase is "walk through the fire," suggesting that someone is willing to endure the pain and difficulty of a particular situation. Other synonyms that convey strength, resilience, and determination include "persevere," "withstand," and "surmount." Ultimately, the phrase "go through fire and water" represents someone who is committed to facing any obstacle, no matter how difficult, in order to achieve their desired outcome.