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Idiom aside, the structure you should be trying to use is neither/nor instead of the literal not/not
“Neither” combines two different negative ideas and separates them using the preposition ” nor“. For example:
- Neither Henry nor Chris want to go to the beach. (Ni Henry ni Chris quieren ir a la playa.)
- Neither the school nor the parents want to take responsibility for the problem. (Ni la escuela ni los padres quieren asumir la responsibilidad del problema.)
Therefore, it’s neither chicha nor lemonade. However, in case you are curious about it, the correct idiom would be “It’s neither fish nor fowl (nor good red herring)”.
Have a nice day!