It really is simple. ANY hardware store or Home Depot has "hardware cloth". That is just heavy wire...that is sold from a roll.. 1/2 inch by 1/2 inch wire works well... One foot from the roll will make 6 "ladders". Home Depot will even cut them for you-- pieces should be 6 inch by 12 inch. Try to bend down any wires that stick out from the sides. Then you press it ( the ladder) down over the top of the bowl. It bends very easily.
GOOD LUCK.
You CAN Do This...