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An easy and low tech way to find the volume of an object is to measure the volume of water it displaces. Fill a container that has lines for measuring volume on it with enough water to fully submerge the object whose volume you will measure, but don't fill it all the way to the top. Write down the amount of water you start with, let's say 1 liter. Now put the object you want to measure into the water carefully so that you don't splash any water out and make sure that it is fully submerged. Now write down the new volume of water in the container, let's say it now reads 2.5 liters. Subtract the original volume from the new volume to find the volume of your object: 2.5L - 1L = 1.5 liters.
Another way to find the volume of an object fill a container with water to the very top of the container. Place that container of water into an empty larger container. Put the object that you want to measure into the container of water slowly so that you don't spill any more water than the object pushes out on its own. When the object is fully submerged, it should have pushed out some water into the larger container. To ensure accuracy, the level of water in the water filled container that now also contains the object to be measured should still be at the very top of the container. Carefully remove the water/object filled container from the larger container so as to not spill any more water. Carefully pour the overflowed water into a smaller measuring vessel to find the volume of your object.
