Must have item at WDW and why

[Meglen]

What is your ONE must have item to bring to WDW and why?

[Multi usb charger]

When I have to charge everyones phones,watches,batterys this is a must for my family.

 

[Heluvsme]

Definitely agree on the charger!

Sunscreen for my family! I know I can buy it there, but I get it so much cheaper here at home.