I lost my free travel 16+ Oyster card! How can I still get free bus travel?

Today I lost my 16+ oyster card which allows me to free bus travel and reduced tube and train access... So my question is, can I use my NUS card when I get on the bus tomorrow to show them that I am entitled to free travel? My NUS card states i'm in full time education and also how old I am. Also, how do you apply for a new one!? Thanks!