Natural emergency solution for ear protection.

 Conks are medicinal, common mushrooms in Canada; they are year long, woody, tough, peices of spongy material you can't chew apart. Find one among the trees, and cut a chunk you can separate into two disposable plug size chunks. Shape these two chunks to look as best you can as the ear buds for hearing protection, then carfully chew or maserate them gently until they are slightly softer. 

The chewing will saturate them with liquid, as well as soften them so you can twist them and stuff them in your ear. The water will help to drown out sound and the two buds will work just as well at blocking sound as plastic ones you buy.