What kind and size tokens are needed?
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You can use any small items you have lying around, but what I use are those little 8-12mm cubes and discs that come in some board games like Lords of Waterdeep or King of Tokyo. I'll put links to places you can buy them below.
Nowadays, I use a disc to represent the ship and different colored acrylic cubes to represent the crew, the longboats, and camp. You will also need a token to note the time of day on the tracker, which can be larger, like a penny. See the first photo on the product page to get a feel of the size; that photo shows wooden cubes, but the metal or acrylic ones are about the same size.
I've also seen people make little cardboard tokens, just by gluing paper to cardboard, writing what it represents, and cutting it out. This is cheap and easy, and is especially nice if you have some artistic flair and can draw a little evocative image on the token.
You can also play entirely by using a pencil and an eraser on the map, without any tokens at all, just annotating on the map with a symbol where everything is. This is good if you want your game to be portable and quick to set up and put away, but the map can get a little busy if you have a lot of notes, too. (In that case, I'd recommend keeping a separate log for notes of what's in each hex, like cave passages to adjacent mountain areas.)
Happy expeditions!