Wow, thanks man, this is the mission I've been waiting for! Ever since I played the undead mod I've been looking for a mission with food and water! Just played it with two of my buddies, and it worked great. Can't wait to see what else you can do.
I'm not sure how to change the position of the infection counter, or how to disable it. The way you change the infection time is
1-go to modules and play a function module. (any where doesn't matter where you put it)
2- in the init field of it type this
replace the 10 with any number you want the infection time to be. The time is in seconds. You don't have to sync it with anything.
Hope this helps