Yumi and wifi

Not sure if this is the proper forum for this question. I have a usb flash drive created by Yumi and I also have several programs on it, including av-rescue disks. I was wondering there was a way to have wifi enabled and configured before running any of the programs. I noticed that several rescue disks have the ability to update bia wifi. The problem is that my wifi password is very long and gibberish. I though if the was a was to have the usb drive to connect the laptop to the proper network (ssid) with the password. My laptop is too fave away from the router to connect to it via cable and it would a pain to move the laptop.

Another way I thought, would be to save the password in a text file and then just copy and paste. I am not sure how I would go about opening the file to copy the password though. Any ideas would be appreciated. Thanks.