Okay, first of all, welcome to the forum!Congrats on rescuing it!
Setup:
1. For a single american toad (what you likely have) a 10-20 gallon fish aquarium is best.
2.For substrate (bedding) line the bottom of the tank with roughly 2-4" of eco-earth soil (can be bought at most stores i.e. home hardware, Canadian Tire, etc.) as it contains no chemicals that are harmful to your little toad.
3. MAKE SURE YOU USE NON-CHLORINE WATER AS CHLORINE WILL KILL THE TOAD, USE BOTTLED WATER, OR IF YOU HAVE A WELL, YOUR FINE. For a water source take a small tupperware bowl, and place it in the tank so it is even with the soil line (press it down into the soil). The bowl should be 3 toads long, 3 toads wide, and 1.5 toads deep. Put small, smooth pebbles on the bottom of the bowl.
Amphibians do not "drink" water, you will not actually see it consuming the water, rather sitting in the water, absorbing it through their skin, this is how amphibians "drink".
For actual tank setup give the toad places to hide & burrow under (slanted rocks, drift wood and some live plants).
Here is my tank setup just to give you an idea:
Food:
For food, toads eat crickets, worms, spiders, beetles, etc. I recommend ordering insects form this website: Canadian Feeders - Your One Stop Feeder Shop!
They provide a care sheet on the website explaining the pros & cons of each insect, how to care for it, and where and how it should be kept.
They also can ship during the winter, as they put heat packs in the boxes, so don't worry, you can buy food the entire winter from them. I get all my insects from them.
I recommend starting the toad off with cut up worms, he/she will love them, and worms (aka night crawlers) are extremly easy to care for, just keep them in a fridge where they will stay dormant, and can last up to months, or a large container (ie 40 liter Rubbermaid bin) filled with eco-earth at room temperature, mixing in veggies, rotton leaves, etc in this, the worms will eat, grow, and they may even start to breed!
Feeding:
You can do three things:
1. Put the food in the toads tank, and allow him to hunt, but if you have a small toad, he may be unable to hunt the food adaquatly, or if your tank contains a lot of objects where the insects can hide, it makes it difficult for the toad.
2. Feed the toad by using tongs like in this video: (I know I't a bull frog, not a toad, but I couldn't find a toad one, BUT i"m sure you get the idea)
3. A feeding mat like in this video (take the toad out, place him/her on the mat, and drop the food in front of them):
If you need any other info, just ask, I or one of the other great members of this forum will answer you.
Hope all goes well!
~Royce