Water for your pet toad
There are a variety of toads that are kept as pets but like all amphibians, they need both land and water in their enclosures. Since toads absorb water and oxygen through their skin the kind of water we use in their homes is very important to their health.
It may not sound important but the kind of water you use to keep your pet toad moist can play a big role in his overall health. Believe it or not, the types of water you get from your tap, fridge, bottles, jugs, and outdoor stream are all different and some are safer than others. Minerals and salts are necessary in the water you choose while chemicals like fluoride and chlorine are not. A neutral pH of 7.0 is ideal while a pH under 6.5 and over 8.5 is unsafe.
City Tap Water
Depending on what country you live in and what city, state, province, or district filtration practices occur, the contents of your tap water can vary greatly from place to place. Some cities already remove the chlorine that is found in your water while others contain a variety of chemicals deemed safe for consumption in the small amounts that you drink.
If you use your tap water for your pet toad then you need to either let the water sit for 24 hours to let the chlorine dissipate or remove the chlorine with special de-chlorination drops (like DeChlor) you buy at the pet store. Some cities now use chloramines instead of chlorine in the water which can be harder to remove. Check your water bill to see if it is listed or call the water department to see if the water is aquarium fish safe. If you aren't sure you are better off not using tap water.
If you use well water instead of city water in your home you may or may not be able to use it with your toad. Some well water is too high in iron or has an inappropriate pH for amphibians.Other times it is not properly oxygenated. The pH can be tested with test strips from the aquarium store to make sure it is about 7.0 or neutral and the oxygenation and iron concerns can be resolved by aerating the water. Aeroation can be done with the use of a simple aerator sold in the fish department.
Toads need the minerals that are found in natural water and include sodium chloride, potassium chloride, and others. Bottled water is typically spring water that is treated but then has these natural minerals and salts added in. Bottled water is the safest type of water to give to your amphibian and you don't have to alter it in any way. Read the label of the bottled water to make sure it isn't really distilled water and that it has been treated by reverse osmosis, filtration, or another kind of process to remove chemicals.
You should never use distilled water with your pet toad. Distilled water has none of the important minerals and salts that frogs require from their water, has more hydrogen than tap water or bottled water, and has an acidic pH (less than 7.0). All of these variations make distilled water unsafe for amphibians to soak in, hop in, swim in, and drink.
If you don't like the idea of purchasing bottled spring water, don't have a reverse osmosis system in your kitchen sink, and have no filtration system like a fridge filter, Brita, PUR, or ZeroWater (with some brands doing a better job of chlorine and other chemical removal than others), you should either purchase de-chlorination drops from the aquarium store, boil the water and then let it cool, or allow your water to sit for 12-24 hours before putting it in your toad's enclosure. If you are still concerned that there is chlorine in the water you can purchase test strips to check the level prior to use.