For all of you who deliver your cakes, do have have a first aid kit? What do you have it in? What are the essentials for a potential "oops" away from your kitchen?
I usually only bring these items if I am delivering a wedding cake. I usually bring a bag of icing with a round tip and whatever tip I used to make the border. I also bring a small spatula and a few viva paper towels. If I have used edible pearls on the cake...I will bring some of those too. 
My repair kit has gotten bigger over time. This is what I have in mine: extra icing, extra bag with coupler (in case of a bag blowout) tips 1,2,3,4,5, petal,shell,rose.I keep these in a sm. container, that way I always have them for any cake,viva towels, several spatulas, sissors, flower nail, knife, sm. paint brush (for luster dust and any "stuff" that gets on the cake). I have a door stopper, wet cloth, and I carry a few sm. cardboard discs (helps level a table or a cake stand). I keep it all in a sm. igloo container.
I need to add the door stopper. I don't know how many times I have been to deliver a cake and could find nothing or anyone to hold the stupid door!
There was another thread about this and i made a list of most all the things people suggested. Sorry in advance for the length:
Cake Decorator Emergency Kit List
It's not only handy to have along, but absolutely necessary when delivering a Wedding/TieredCake! Here's some items you may want to throw in a bag:
1. Map to reception/party site
2. Telephone # of site
3. Telephone # of contact person
4. Calculator
5. Contract / invoice / delivery form
6. Bride's top ornament
7. Cutting knife & server set (in case one is not provided)
8. Extra icing in colors used on cake
9. Decorating bags
10. Tips used to decorate the cake
11. Couplers
12. Spatulas
13. Frosting Flowers
14. Fresh or silk flowers/greenery
15. Flower spikes
16. Oasis & a container
17. Picture of the cake
18. Columns/pillars, plus extras (in case of necessary last-minute design changes)
19. Dowels, including sharpened long dowel for center
20. Rubber Mallet for hammering center dowel
21. Chocolate Shavings for between separator plates and cake
22. Stairways & bridges necessary for design
23. Ribbon (a bow can cover a multitude of sins)
24. Tulle (adds 'pouf' & volume if necessary)
25. White plastic tablecloths (available at the dollar store) to cover ugly tables
26. Wire
27. Florist's clay
28. Bases
29. Extra ornament
30. Styrofoam meat tray
31. Scissors that can also cut wire
32. Rose nail & scissors
33. Tweezers
34. Toothpicks
35. Meat or kabob skewers
36. Paper towels - regular
37. Paper towels - VIVA (for smoothing)
38. Wax or parchment paper and plastic wrap
39. Wet washcloth in plastic bag or moist wipes
40. A level
41. Shims to correct uneven tables
42. Measuring tape
43. Camera, film, and extra battery
44. Business cards and a holder
45. A congratulations card for the Couple
46. An ink pen & notepad
47. Clear tape & double-sided tape & masking tape
48. Small hot-glue gun
49. Dressmakers pins (for securing fabric when necessary)
50. First Aid Kit incl. Band-aids, Antibiotic ointment & Tylenol
51. Apron
52. Garbage bags
53. Latex gloves
54. Doorstops (4)
55. Fountain Items-
a. Fountain- check for proper operation before event
b. Extension cords
c. Duct tape
d. Distilled water
e. Color for water
f. Flower Holder Ring
g. Cascade set
56. For the Bride-
a. Cutting/serving instructions
b. Latex gloves for the server(s)
c. Box for Anniversary cake
d. List of pieces to be returned
e. Box or bag for plates & columns
57. For Non-Wedding Cakes-
Birthday Candles that coordinate with cake
Matches or lighter
Again, apologies for the length.
Copy and paste that list into a Word document and print it.
I would love to add more stuff if someone can come up with more
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