Single-serve powder packets and compact squeeze concentrate bottles are the most portable options. They fit easily in a bag, pocket, or car and are simple to mix into a bottle or glass of water.
Lemonade mixes commonly come as powdered packets — both pitcher-style packets and single-serve packets — and as small liquid concentrates sold in squeeze bottles.
Typical powdered lemonade packets list about 5 calories per prepared serving (some list about 10 calories). Several liquid concentrates are listed as having zero calories. Many mixes are described on packaging as containing 0 grams of sugar per serving.
Preparation depends on format: pitcher-style powdered packets are mixed into about 2 quarts (8 cups) of water; single-serve packets are mixed into roughly 2 to 2.5 cups of water; liquid concentrates are added to water and stirred according to the bottle directions.