Forum:Blowing up the supplies at the cornucopia?

Hello to my fellow tributes!
Okay, so I'm a huge fan of the series (both books and film) but I was recently watching the movie again and was confused about something...Whether this be because I have forgotten or something, I'm not sure, but I hope someone can help me out!

So, in both the book and the film, Rue and Katniss set out to destroy the supplies the Careers have at the cornucopia. Rue distracts them with the fires in different areas whilst Katniss goes to destory the supplies. But here's where I'm confused...Katniss had her bow and arrow and nothing else. She didn't know about the explosives piled around the supplies which is essentially what she used to benefit her and to blow up the food.

So, this being said...what was she planning on doing before she knew about the explosives from the plates? Was she going to shoot it all, take it? No..they wanted to destory it...so, what on earth was she going to do before she realised she could use the explosives?

This may sound stupid but this was running through my head for a bit... So, help me out fellow tributes!