YES, a MUST do!! I always bring a bottle of water with a paintbrush, papertowels, extra icing that went with cake(in piping bag or container), crisco in a container(not the actual container(wouldn't look right at reception)), piping gel in case water isn't enough depending on weight of decorations, extra made decorations in case of breakage on travels, and your camera! That's all I can think of! Get in the habit of it..important,,most time I don't need, but one time it was needed indeed..you NEVER know! Photograper took pics of me fixing up a cake one time..so make sure you look professional, OH and GLOVES!! Do NOT touch cake without gloves ! Make sure you bring those too..Best of luck!