This is my first time to see this issue. But since I trust you guys. I suggest that you should provide the screenshot of actual spending receipt on the spreadsheet and also the value in fiat of Bitcoin by the time you convert and used it to purchased items needed for donations. Just indicate the miscellaneous and other extra things that you purchased so that the value will tally and everyone will have a peace of mind.

People just want see that spending will be equal to the total donation. I know that you need to use some money for miscellaneous like transpo, your labor fee and other expenses. Just be honest and declared all the expenses. You can do this.