It's important to ask questions that are concise and specific (within the recommended character limit). To get clean data, make sure to use simple, clear phrasing that avoids jargon. This includes using familiar terms instead of technical ones, such as water instead of H2O.
Try asking How many times have you bought orange juice within the last 12 months? rather than Did you buy orange juice? as a way of finding specifics about consumer purchasing behavior.
Avoid providing examples to the respondent. For example, consider the following two questions: How often do you eat vegetables? and How often do you eat vegetables (e.g., spinach, Brussels Sprouts)? In the second question, the respondent is far more likely to only consider how often she eats those two types of vegetables, instead of how often she eats any kind of vegetables.