And now, for some total geekery!
I don't know if this always existed or if this feature appeared during some update. However, you can create subtask in OmniFocus on your iPhone. I didn't know this at first and it frustrated me that I couldn't, and then I figured it out.
Depending on how you start out, you have to do different things. For this example I'll start in the 'Projects' list and in my 'health' folder. I have no current projects there.
Tap the plus in the lower right corner and create a new project if you need to.
Tap on your newly created project (you might already have a project you want to change / add things in, if so, go there through the main screen and then 'projects', and skip all these previous steps ;) )
Fill in the desired values, I've left most empty because I just want to make an example.
By going to the project list from the mainscreen you prevent things from disappearing on you, plus, you actually want to edit the project, so going through the project-list makes more sense.
The last two actions need to become subtask of 'Make list of medication' so I tap 'Check bottle of pills #2'
And now, the magic happens!
Tap on that folder-icon on the bottomright.
Repeat for all the tasks you need as subtasks.