Pull info from a website

How do I get my app to simply read text that was written down on a google site.

I am working on a calendar app for students and I am planning to have a website that is simply plain text, the text is how the data will be stored ( not a lot of data needs to be stored and I see this as the easiest way ). The expected result is that when the app is run, it will use the grade level selected to pull text data that is used to generate their calendar.

I have not begun working on the application yet, but so far I have not found a way to make an app read text from a website