The correct way of using perfect tense

My question is about I wanna say to anyone about - i have not take shower for three days. What will be the correct form?

• I have not taken shower since three days.
• I didn’t take shower for three days.

You said it yourself. The correct form is:

I have not taken a shower for three days.

This would be the correct form using Present Perfect.

"I didn't take a shower for three days" uses Past Simple, not Present Perfect. And

I have not taken a shower since three days.

Would be incorrect, because "since" should indicate some time point or event, and not duration ("three days").