I just tested this out. The noodles weren't ready at 5 or 10 minutes, but they were acceptably soft at 20 minutes. They absorbed 108 grams of water, which according to an online calculator I found, is 3.65 fluid ounces. They could have been a bit softer, so 4 ounces would probably be fine. I figure, if I want just noodles and not soup, I can add just the right amount of water in a bag with the noodles and knead it from time to time.

I also tried it with the seasoning packet, but since I had drained off the water, it was too salty. It would probably be fine with other added ingredients, maybe some dehydrated carrots, corn, celery, maybe even some tuna or chicken.