I will...
In Mandarin, how do you say that you will do something (i.e I will eat, I will drink, I will sleep, etc.)?

Question

Answer

don't use "我要"，haha，我要 generally means "i want"

Answer

it depends, in chinese there is no fixed form to express future state
for example:
I will do it in two days,我(会)在两天之内搞定它
We will eat the pancake at 11am.   上午11点的时候我们(ellipsis)吃蛋糕
I will sleep at 12 pm today.   今天我(打算)晚上12点睡

BUT I'd like to tell you there is an universal word can be used in most situations——"打算", although sometimes not that appropriately.

I will do it in two days,我(打算)在两天之内搞定它
We will eat the pancake at 11am.   我们(打算)上午11点吃蛋糕
I will sleep at 12 pm today.   今天我(打算)晚上12点睡

Answer

我要。。了