There will always be unforeseen situations that will delay your plans. By having a Do-it-Yourself Wedding Survival or Emergency Kit, this will be a great way to help the bride and groom to prepare for any situations. 

https://www.theknot.com/content/the-brides-emergency-kit

Below Informations are from www.theknot.com

DIY

If you're planning on making your own emergency kit, here's a list of essential (and some optional) items to pack:

• Aspirin (or pain reliever of choice)

• Band-Aids

• Bottle of water

• Breath mints/spray

• Cash (because you never know)

• Chalk (to cover up any last-minute smudges or smears on your wedding dress)

• Comb/brush

• Corsage pins

• Dental floss/toothpicks

• Eyedrops

• Extra earring backs

• Hairpins/ponytail holder

• Hair spray

• Hand towelettes

• Hem tape

• Makeup (for touch-ups)

• Matches

• Mini sewing kit

• Mirror

• Nail file

• Perfume

• Safety pins

• Scotch tape

• Small folding scissors

• Smelling salts (we don't expect anyone to faint, but it has been known to happen)

• Sole Serum (a numbing cream that makes wearing heels easier)

• Spot remover

• Static-cling spray

• Straws (so you can stay hydrated without messing up your lipstick)

• Tampons/sanitary napkins

• Tissues

• Tweezers

Optional DIY Items

• Granola bars or other easy-to-carry snacks

• Krazy Glue (for nail fixes, shoe heels, decorations, even jewels)

• Sunblock (if you'll be outdoors)

• Drinks pouch