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Yes, you can use zero-calorie flavor packets during fasting, but any packet with sugar, calories, or protein breaks the fasting period.

Yes, plain water is fine during fasting for most blood tests unless your clinician says otherwise.

No, for fasting blood tests, stick to plain water; sugar-free drinks and sweeteners can affect results or break lab rules.

Yes, Splenda during a fast can fit a calorie-abstinent plan, but packets with maltodextrin add carbs that break a strict fast.

Yes, drinking plain water during a 16:8 fasting window is allowed and recommended for safe hydration.

Yes, plain water is allowed before a fasting blood test; skip coffee, tea, juice, and any drinks with calories.

Yes, during intermittent fasting, plain water is okay and unsweetened tea is allowed; avoid sugar, milk, and other calorie add-ins.

No, drinking V8 during a calorie-restricted fast breaks the fast; it’s only allowed on plans that permit vegetable juice.

Yes, plain unsweetened iced tea fits a calorie fast—skip sugar, milk, and sweeteners to keep the fasting window intact.