Thats 7

You can be measuring water evaporation

1) Round Bottom Flask

2) Condenser

3) Graduated Cylinder (for measuring)

4) Beaker (to catch distillate)

5) Heating device such as a Bunsen Burner (or, preferably an electric heater fit to a round bottom flask)

6) Rubber stoppers for the joints

7) Rubber hoses for the running water (to cool the condenser).

Too bad I can’t draw a picture for you.

you need bunsen burner, a boiling flask, rubber hose, a graduated cylendar, bucket of ice, and a few odds and ends like stoppers, a flint, and a stand for the boiling flask.

put boiling flask filled with salt water under bunsen burner. attach hose from top of boiling flask into a graduated cylander that is in a bucket of ice. light the bunsen burner. the salt water should boil and force the evaporated gas through the tube were it recondenses into the graduated cylendar as fresh water leaving the salt behind in a brine.