The biggest health threat from home made sauces is botulin bacteria which cause botulism. To be 100% sure of avoiding stopping botulin you need to get the pH down below 4.6 by adding vinegar (not malt vinegar but wine or cider vinegar... taste is less harsh) and/or squeezing citrus fruit juice in there. Happily this is generally enough to inhibit other spoiling agents but you should also sterilise your jars/bottles (boiling water for 5 mins then dry in a hot oven, or use an agent like sodium metabisulphite (Campden tablets) but be aware they may add a sulphurous tang).