Apart from my medications and my wife (not necessarily in that order LOL) There are a number of things I just can't live without. They include: (1) sugar-free chewing gum (because it keeps my mouth moist and my teeth unfurry! (2) saline nasal spray (FESS in Oz) which I use quite liberally as it moistens my nose and loosens the accumulated mucus both in my nose and also my throat (many of us suffer from sinusitis or post-nasal drip) - its not magic but it helps. (3) my exercise bike (for obvious reasons, and I am ignoring my treadmill - also for obvious reasons - too hard work unless I am feeling really good or need to engage in some masochism! (4) my massage chair which eases the muscles in my back - used regularly.
Without them life would be a little harder to cope with.