Drinking for a choleh sh'yesh bo sakana

Is it necessary to have the choleh who must drink measure his cheekful before YK? What if he’s unwilling or unable to do so? Is there a standard amount that can be used?

What is the amount of time required to wait between drinks?

Can the choleh drink soda, coffee, or tea if he wants, or only water, since that’s all he really needs?

The amount to be used for liquid Shiurim if needed is 1.5oz every 4.5 minutes. It is recommended to drink something that will give energy like juice. Plain water usually isn’t the best choice.