I remember entering Australia on a flight where they Xrayed everything for food and it took forever as people were forced to dig out the hidden contraband. I had some food in a readily accessible place, pulled it out and showed it to the officer and sailed through. IIRC I had real coffee and instant for my caffeine addiction, some non packaged cookies, chocolate, crackers, and processed fake cheese sealed in plastic.

I like to be assured of being able to make coffee in my hotel room and to be able to snack when I wake up in the middle of the night starving as part of jet lag. Most hotels don't offer appealing room service at all hours.

Something else to be aware of when going down under is that ingredients in many common over the counter medications are strictly forbidden. You need to remove the stray packet of cold pills from briefcase, purse, corner of suitcase, hidden backpack pocket, etc. or risk potentially serious legal problems.