What is the test of fungus/candida? please reply me in detail, which test should be done if i suspect of eseophugus candida, and can it spread muscles if we are taking tap water.

Probably unnecessary: If you are not immunosuppressed by drugs, have no diseases charactized by immune deficiency (e.g., HIV, certain cancers), and have not been on antibiotics recently, the chance you have esophageal candidiasis is almost zero and no testing is necessary. Don't be fooled by online nonsense about "systemic candidiasis". Candida does not spread to muscles, and does not come from tap water.