Saturation Point

Like I mentioned before, I had these two possible ideas for my experiment, one of them being the viscosity of liquids, as explained in my pervious post, and the other idea is the saturation point of water using different additives, which I will explain in this post.
So this basically is testing how much of a certain additive can I dissolve into water before the water can't possibly hold anymore. This could be done by using the same amount of water, and adding the same amount of different additives each time, or changing the temperature of the water (for example, leaving it in the fridge, or boiling the water) and testing whether the same amount of one additive, which I will use throughout the whole experiment, is able to dissolve into the water, or is the water able to take more or less than the base amount. If so, by how much.

For this experiment, I would need a measuring jug/ cup to measure the water and the additives, different types of additives, for the first experiment, or just one type for the second, and objects that will change the temperature of the water, for example, a stove and a fridge.

I will later on announce my final idea in upcoming posts, and get started on conducting it.