Preservatives and Anti-Fermentatives for a Organic Hot Sauce of natural ingredients.

Hi, we are a company that makes sauces of fruits combined with habanero pepper sauce, the ingredients we use for it is habanero pepper, onion, garlic, and fruit, we have 3 presentations: - Mango - Tamarind - Carrot+Garlic We would like to know what kind of preservative that we could buy in Mexico, can help us for the process of having an expiration date of aproximately 3 months, we would like that this chemical is organic, or somehow is friendly with the body, and its natural thats the main idea of using something like this, also that don't ferments the sauce and changes the color of the ingredients like the fruit, things like that. that don't oxidize the fruit. IMPORTANT NOTE: Please include source chemical stores that sale their products inside Mexico and give us contact detail for purchasing the chemicals. Thanks.