Drug reminder app

Hello,

I am an elderly person and in creating an app for my phone that will remind me when I am running out of medication and when I need to go get a new prescription or buy another pack. I don't know much about technology, so I'd like to describe it as simply as I can.

I want to add up all the medications I'm taking, I have different packs of 60 or 30, and some already half selected, for example. I take medications in different ways. Sometimes it is 1 tablet a day, sometimes two, and sometimes half a tablet a day. I also have a medication that I take 1 tablet every other day. I want the app to count it for me when my medicine runs out and remind me a week before. Or maybe sometimes even 2 weeks, because it takes longer to see some doctors. I would like such an app to show me a big reminder on the whole screen of the phone, about the medicine, but I don't know if this is possible because what if I run out of two medicines, one reminder on the screen will cover up the other one.

I would like me to see the added medications on the screen in a nice order like a shopping list with the date when the medication runs out.