Eat out and eat in?

My question, can I say,
Today I will eat out, not eat in.
I mean to say I want to eat at home not at restaurant.

If you're going to a restaurant you're eating out. If you stay at home you're eating in.

We don't usually say what we're not doing although that's certainly possible. Anyhow, if you're doing one you're not doing the other.

sdgsdg said:

My question is Can I say "Today I will eat out, not eat in"?

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sdgsdg said:

I mean to say I want to eat at home, not at a restaurant.

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No — exactly the opposite.

So, I can say,
Today, I will eat in.

sdgsdg said:

So, I can say no comma here "Today, I will eat in." Is that correct?

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You could say that if it's unusual for you to eat all your meals at home. Otherwise, I can't think of a context in which you'd need it.

Bear in mind, though, that "eat in" can be used in a restaurant setting as well. If you walked into a coffee shop, fast food place, or similar, and ordered a coffee and a burger at the counter, you might be asked "Is that to take away or eat in?" The person would mean "Do you want to take it away and eat/drink elsewhere or do you want to have it on our premises?"

Yes, that's correct.

sdgsdg said:

Yes, that's correct.

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What does that refer to?

While the food itself isn't prepared any differently, if you order take out they will bag it for you. (They will put the food in containers and put the containers in bags.)

Yes, I got it.

It's clear that delivery means eat out and if I eat at home that means I eat in.
I make a decision, today I will eat in, no need to eat out.

sdgsdg said:

It's clear that delivery means eat out and if I eat at home that means I eat in.

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No. If you get a delivery, then you eat the food at home. You order the food online or by phone and someone delivers it to your house.

sdgsdg said:

I make have made a decision - today I will eat in; there's no need to eat out.

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So delivery means to eat at home or eat in.
when I am at restaurant, the counter person might say.
You need delivery or eat in.( at the restaurant).
I am confused .

sdgsdg said:

So "delivery" means "to eat at home" or "eat in".

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No. "Delivery" means the food is brought by someone else from the restaurant to your house. You'd eat it at home.

sdgsdg said:

When I am at a restaurant, the counter person might say no full stop here "Do you need delivery or do you want to eat in (at the restaurant)?"

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No, if you're at a restaurant, you wouldn't be ordering a delivery. You do that from your home. If you're at a restaurant, you either want to eat the food there (at one of their tables) or you want to take the food away in bagged containers and then eat it at home. There's no delivery involved.

sdgsdg said:

I am confused .

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That's very clear.

Ok. That's mean take away or eat out.(not at a restaurant).

@sdgsdg No. If you say you are going to eat out people will assume you are going to eat at a restaurant.

As for take away ("takeout" in AmE), you pick the food up at the restaurant and take it wherever you want to. Usually that means you eat it at home.

I suggest that you reread the posts in this thread.