If you can not find what you think to be an appropriate line, then write a short phrase with the amount and put it in Part V. Things like Fuel $X,  Required meals $Y, 

I know this is for the owner, but I am thinking you want some type of line by line for Sch C, so try this http://www.jdunman.com/ww/Business/SBRG/publications/p59507.htm

Good luck!