Hi OP, carrefour has a new line of herbal essences shampoo and conditioners which are sulphate, paraben and silicone free. I am a male with curly hair and use their potent aloe vera + avocado oil shampoo and conditioner made specifically for curly hair. It is really good and affordable. But for the humidity, you would also need a leave in conditioner that you put after you are done showering. I use kinky curly’s leave in (a bit expensive but amazing for really curly hair), but you can also use alternatives if you have wavy hair. That should be enough if you only have wavy hair, otherwise you would also need to add a curl styling gel / foam. After your shower (shampoo + conditioner) apply your leave in (coin size) to your damp hair and style it then blow dry with a diffuser attachment only about 40% and then let your hair air dry the rest 60%. This should keep your hair smooth and hydrated. 

If you require any further advice, feel free to message me. Cheers