Tonic water is a carbonated soft drink which has been around for centuries. It originates from British Colonial India and is still popular today. It has a slightly bitter taste and contains quinine, which is a bitter alkaloid. Quinine helps to fight malaria and is thought to have medicinal properties. Tonic water is often used as a mixer for alcoholic drinks, such as gin and vodka. It can also be enjoyed plain, with ice and a slice of lime. Tonic water contains artificial sweetener, so it is a lower calorie alternative to colas and other sweetened soft drinks. In recent years, the market has seen an influx of flavored tonic waters, such as lime and ginger, as well as more calorie-conscious options.