Parse list? and spread items across page

I need to store a lot of data in 1 box of a database. I have 2 main questions. How do you best format the incoming items to be distributed. And how do you make each item appear as a bullet point in a paragraph box

Want the database to look like this:
item,item2,item3,item4,item5

How do I go from a user inputted text to adding to this string? And from here how do I get specific data points out of the string in no particular order. Like to go to

  • item

  • item2

  • item3

  • item4

  • item5

Each item on its own line like pictured above. (Probably easy but im new here)

Thanks in advance