How on earth do you remember everything that is masculine and feminine?

Mish L
20 yrs old, God, Corgis, Nail Polish, and Everything British
How on earth do you remember everything that is masculine and feminine?
ALL the words sound feminine.
Ugh, I always have this problem with Latin. What makes ‘water’ feminine?!
I’ve been in french for two years...all I can say is Je m’appelle Carissa