It was non't cold thereoday.

Your sentence is grammatically correct but this is more how we'd write and say it in the US.

I just drank a water, then I washed my face and brushed my teeth.

In the US, we usually say, "I drank water," without any particles. If someone gives us a choice of beverages, then we can say, "I drank the water."

I started my day toby cleaning the window in the kitchen because it was very messy and there was thea lot of dust.

Then I cooked chicken thighs and potatoes in the oven, and prepared a tea.

In the afternoon, I reviewed some lessons in English and read one text a loud.

It was not cold there.

Putting "there" sounds as if you want to say it wasn't cold only in your bed/room

I just drank a glass of water, then I washed my face and brushed my teeth.

Either "a glass/bottle of water" or "some water", there's no article with water

I started my day toby cleaning the window in the kitchen because it was very messy and there was the(a lot of/some) dust.

Then I cooked chicken thighs and put potatoes in the oven, and prepared a tea.

In the afternoon, I reviewed some lessons in EnglishEnglish lessons and read one text a loud.

It was not cold there.

Alternative: It was not cold today.

I just drank asome water, then I washed my face and brushed my teeth.

I started my day toby cleaning the window in the kitchen because it was very messdirty and there was the dusty.

Then, I cooked chicken thighs and potatoes in the oven, and prepared a tea.

In the afternoon, I reviewed some lessons in English and read one text aout loud.

It was not cold there.

or just "It was not cold."

I just drank asome water, then I washed my face and brushed my teeth.

I started my day toby clean the window in theing my kitchen window because it was very messdirty and there was thea lot of dust.

Then I cooked chicken thighs and potatoes in the oven, and prepared a tea.

In the afternoon, I reviewed some lessons in EnglishEnglish lessons and read one text a loud.