Fixes remaining intake

removes unused variable

Adds drawable files

changed background image to fix text blending

Adds clarity and detail to the water intake remaining in MainActivity…

…2.java

Fixes onNewIntent

Edits the layout of timer_activity.xml and fixes a bug

- Edits the layout of timer_activity.xml to be more intuitive.
- Fixes a bug where inputting the drinking rate and saving it for the first time would crash the app or lead it to the first page instead.