"dont have a brick" No, maybe not, but I'm sure, if you look around your local area, you'll find a brick lying around somewhere, or a rock or large stone or piece of paving slab.
"...but no idea what i can use to make the holes with.... " Err, a drill is the usual thing, I would have thought? (just sitting back and waiting for the reply 'I don't have a drill' - so borrow one!). Sorry, but you just sound so negative.
Or put your rubbish in sacks, as has already been said. It'll stop the bin getting smelly and attracting flies and vermin.