The Kit
Purchase a kit for a terrarium that includes a pond at a local pet store or online. The kits will provide instructions and all of the elements required to build a pond or waterfall. The pet store representatives should be consulted as to the best terrarium for the pet of choice.
Do It Yourself
If you have an aquarium that you are not using, it can be transformed into a terrarium. The aquarium is designed to hold water. There are a number of online sites that detail how to build a pond in a terrarium to act as a guide.
Plastic Containers
Plastic containers can be added to a terrarium to create a pond. Choose the design that works well for your pets and your terrarium. The landscape around the container can be built up so that the reptile or amphibian can slip into and out of the container with ease. The container works well as it can be pulled out of the terrarium and cleaned when necessary.