To seal moisture in your hair, avocao's are a great choice. It is difficult to find it in India and It is quite expensive here too.
And Banana's make hair strong.
all you need:
1 banana
1 avocado
method:
mash avocado and banana together till it has no lumps.
let it sit for around 1 hour.
wash it with cold/lukewarm water, not hot water.