What about using the same technique as McMaster but without McMaster slide?
Here you have a standard protocol. You can do the same but without a slide. Just follow the protocol and instead of putting 0.3ml (2x 0.15ml) into the slide, pipette the same volume on the standard glass slide in few drops and count the eggs. It will be harder and taking more time however, you should gain the same results. Remember that slide is just a piece of equipment to make our life easier, you can do the same without it! Good luck!