I see. I like spicy food and I want to eat it someday.
Using "someday" here doesn't make much sense, since eating spicy food is something that you can do easily and have done before. In this type of sentence, it is usually used for a future goal you have.
>My friend wants to be an astronaut someday.
>Someday I want to go to Japan.
>I want to run a marathon someday.
>and so forth