What happens next in this paragraph?

How to get a fecal sample from your dog
Get a container ready.
Many people use zip-lock bags to collect fecal samples in. Some people use plastic lidded containers that they don't plan on using again.
OPT:
[1]. If this method is not possible for you, another method is to use a cardboard tube. Fill the tube about of the way full with fecal material..
[2]. Remember that fecal samples spread easily and are not safe to consume in large quantities. Fill the container with the fecal sample..
[3]. Whatever container you use, make sure the container is leak proof. If you are worried about finding a good container, you can always get one at your veterinary office..
[4]. This will give you two options for scooping the fecal sample out. One container might already be clean, and you'd still want to use the necessary materials..
[3].