Sugary sweets.
The Queen reportedly sucks on barley sugar boiled sweets in order to tackle jet lag during transit to her many public appearances and state visits across the globe.
GP Dr Nick Knight told the Telegraph that this is probably an attempt to regulate her sugar levels and acclimatise her body clock to the new time zone by mimicking the energy rush of mealtimes.
"Carrying out your daily habits like eating and sleeping in line with your new destination's time zone — both en-route and on arrival — helps re-synchronise our body clock to our new environment," Dr Knight said.
"What the Queen is doing by having barley sugar is essentially using her body's sugar metabolic pathways to help adjust her body clock."
A special supply of her blood type.
The Queen is apparently accompanied by a Royal Naval doctor at all times. If any illness or emergency were to arise, this means that she can be seen to by medical help immediately.
The doctor carries a wide range of emergency medicines for all situations, including refrigerated packs of blood in both the Queen's and Prince Philip's blood types — just in case.
A black outfit.
The Queen may be known for her colourful ensembles, complete with matching hats, but she never goes anywhere without a black mourning outfit in tow.
When the Queen's father, King George VI, tragically and unexpectedly died in 1952, Queen Elizabeth was on a state visit to Kenya.
When she arrived back in the UK, it's reported that she didn't have an appropriate mourning outfit with her — only a floral summer dress. The Queen and her contemporaries had to wait in the aircraft on the runway until a black outfit could be brought onboard for her to change into.
Nowadays, the Queen takes a black outfit with her everywhere, in case tragedy strikes.
Spiral-bound, handwritten itineraries.
With a calendar packed with personal appearances, state visits, and charity events, it's no wonder the Queen runs on a tight schedule.
The schedule's so strict, in fact, that every minute of the Queen's visits must be meticulously pre-planned and timelined in spiral-bound, handwritten diaries that follow her Majesty everywhere.
Every aide on the trip carries a copy of the diary — which includes everything from the second she steps out of her car, the minute dinner is served, and the moment she meets the head of state in front of the cameras.
Framed family photos.
Even after a life on the road, even the Queen still gets homesick.
She "would never dream of complaining," however, according to the Telegraph's royal correspondent Gordon Rayner, who spent 20 years accompanying the royal family.
To combat the blues, the Queen takes framed photographs of her family wherever she goes.
A monogrammed kettle, and Earl Grey tea;
It's reported that the Queen always takes a range of amenities and home comforts when travelling. The Telegraph said she never travels anywhere without her personal, monogrammed kettle and Earl Grey tea blend.
Harrods' sausages
Travelling across the world, the Queen eats at the hands of hundreds of chefs each year.
While she tends to welcome variety in her menus (although it's commonly believed she avoids shellfish and excessive spice) there are some home comfort foods she keeps on hand — Harrods' sausages being one.
Gin, Dubonnet, and lemons.
The Queen is also known to enjoy a daily tipple of gin, Dubonnet (a sweet wine-based aperitif) and a slice of lemon (pips removed, obviously).
Her entourage takes the ingredients for her favourite refreshment everywhere around the world they go. After all, it's always gin o'clock somewhere.
Pine-scented soaps
The Queen spends many weeks of the year on the road, so it's no surprise that she appreciates the little things that remind her of home when travelling abroad.
Even little things like a familiar scented soap make all the difference, and it's been reported that she favours a pine-scented bar when washing her hands.
A hot water bottle.
According to the Telegraph, another home comfort the Queen never travels without is a hot water bottle.
Toilet roll.
One designated toilet is always reserved strictly for the Queen and Prince Philip everywhere they go. These private bogs often also double up as panic rooms, in case the royal duo were to come under attack.
According to one aide who spoke to the Telegraph: "Hosts spend more time worrying about the loo arrangements than anything else, down to what colour the towels should be and whether the loo roll is a suitable brand."
Hosts shouldn't need to worry though, because — like every well-prepared globetrotter — the Queen always comes prepared and brings her own loo roll with her wherever she goes.
