Coolers will work,
Add a little salt to your water.
Go to Wal-Mart buy a small bubbler from the pet section, some air house and a small diffuser stone. You can get the double headed ones that will handle two coolers. While you are there go to the electronics dept, get and AC inverter so you can plug them into the cigarette lighter in the vehicle. You can run an extension cord if needed. I have been doing this for some time with great success.

Goofing off is a slang term for engaging in recreation or an idle pastime while obligations of work or society are neglected........... Wikipedia