Help the confused tourist write a text message to their local friend. Choose the correct word for each blank.

Help! There are so many people at this train station, and I am completely lost. I don't have much battery left on my phone to use the map. Luckily, I took a lot of screenshots of the directions earlier, so I hope I can find my way!

There are so many people at this train station...

"People" is a plural countable noun. We use "so many" to emphasize a large number. ("So a lot of" is grammatically incorrect!)

I don't have much battery left on my phone...

"Battery" (in the sense of power) is uncountable here. We use "much" in negative sentences for uncountable nouns.

Luckily, I took a lot of screenshots of the directions earlier...

"Screenshots" is a plural countable noun. In affirmative sentences, "a lot of" is the most natural choice. "Much" and "a little" are only for uncountable nouns.