Anything that isn't a weapon, can't cause damage, and is logical to take with you. If you want to take a cell phone you can, but put your cell phone into airplane mode before take off.
... only that which is absolute necessary on the flight. Rules vary between airlines, ask your airline or check their webpage.
Yes, all prescribed medications are allowed on airplanes.
Yes It is allowed
Phones aren't allowed on airplanes, because they may influence cockpit controls.
You can bring alcohol nipples on airplanes
No you are not allowed.
Yes, they are.