When you "gotta have" something, it means that you absolutely need it or strongly desire it. Fortunately, there are many synonyms you can use to express this sentiment. For example, you could say that you must have it, that it is essential or vital, or that it is imperative. You might also describe it as imperative, crucial, or indispensible. Additionally, you could say that you are dying for it, that it is a must-have, or that it is a non-negotiable. No matter which synonym you choose, you can convey your strong desire for something without repeating the same phrase over and over.