Step 1: Designing the Main Body
Now click Create New Sketch and select the top of the shape(pic 3). We'll measure a smaller circle with a diameter of 7.5 cm. This will mean the wall around it will be half a centimeter thick. That's plenty of strength.
Go ahead and use the same extrude procedure on the outer wall(pic 4). Extrude upwards 3 cm. That will be enough to sink it into a small tuna can enough to squeeze the water out.