YOU SAID:

I don't like onions because my eyes get too watery

INTO JAPANESE

私は目が水が多すぎるので、玉ねぎが好きではない

BACK INTO ENGLISH

I don't like onions because my eyes have too much water.

INTO JAPANESE

私は目が水を持ち過ぎているので、玉ねぎが好きではありません。

BACK INTO ENGLISH

I don't like onions because my eyes have too much water.