dynamic multiple textareas in custom page template

Hello!

I have a few custom page templates on my wordpress site.
On one of them (and only it) I need an option to add as many textareas that I want, basicly by clicking an “add another” button that just adds another textarea under all the existing textareas, and then loop over all those textareas in the template and display their values one after the other.

What would be the best way to do this? currently iam using ‘advanced custom fields’ plugin which is great, but has no free option to do the dynamic add.

Thanks in advance, Gabi.