If you are careful, you can ride a long ways on a broken spoke, even with a huge load. You have to be really really careful but you can do it. In 2005 I rode a broken spoke from the Jerry Johnson campground to Kamiah, ID (about 80 miles) with a fully loaded touring bike. It was all downhill so I didn't have to put much torque on the wheel and I babied it like crazy but I made it to where I could get help.
Two broken spokes is more of a problem but still ridable. Just don't go hitting potholes or jumping curbs. And get it fixed as soon as you get home!