Water
usually water is added (still or carbonated) but you can also add lemonade, soda water, tonic water you
The main reason is the added sugar.
I will dilute the gravy by adding the milk and heat.
The term 'dilute' means to make a substance weaker or less concentrated by adding another substance, usually a liquid. This process ultimately reduces the potency or strength of the original substance.
it called cordial
To dilute a solution means to add more solvent to it, thereby reducing its concentration. An example would be adding more water to a glass of cordial or syrup to make it taste less sweet.
Water is the most common liquid used to dilute solutions (reduce their strength). Adding anything to water will not change its properties, only introduce other chemical properties. That is, if you added alcohol to water, you would be diluting the alcohol, not the water. You can moderate some of the properties of water by heating or cooling it, or adding solid solutes to make a gel or suspension.
salt
It makes a mixture.
Water dilutes both acids and bases by reducing their concentration. When added to an acid, water decreases the concentration of hydronium ions (H3O+) in the solution, making it less acidic. Similarly, when added to a base, water decreases the concentration of hydroxide ions (OH-) in the solution, making it less basic.
Cordial typically contains fruit juice, sugar, and water, often with the addition of flavorings or herbs. It is a concentrated syrup that is diluted with water or other liquids to make a refreshing drink.
A substance added to another to increase its pliability is called a plasticizer. Plasticizers are chemicals that are added to materials such as plastics, rubber, or concrete to make them softer and more flexible.