1/4" hardware cloth, tin snips, a drill, and small zip ties, and a sharp box cutter.
The lids don't cut easily, and be careful about cutting yourself, but the project isn't too difficult. Bug people do those sort of projects all the time, and tubs altered this way are how I keep my rats.
Fold back the edges of the hardware cloth so there are no exposed sharp edges to injure you or the snake.