Make Reminders with Alarm

Is it possible to make reminders trough the day?
I have this project for a very basic app (I have practiced with processing for 3 days). I want to make an app that reminds you to drink water but I can´t find posts, or I´m not making a good approach on the theme
sorry for any mistakes English isn´t my first lenguage. If you could give me any links it would help me a lot. Here is what I have so far, it´s not good because I´m a begginer.

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Hey There!

Have look at this.