In my recipes I will often tell you to put your jam, chutney etc into sterilised jars. This sounds difficult but is really easy to do at home, without the need for expensive sterilising chemicals and equipment.
You just need to wash the jars in hot soapy water (but not too hot so the jars crack), then rinse and drain. Heat up your oven to a low temperature (about 120 degrees for electric ovens, or gas mark 2). Then put the jars & lids into the oven and leave for about 10-15 mins. When the time is up and either put your mixture straight into the jars if the recipe says so, or leave to cool. Personally, I like to put the mixture into hot jars and leave to cool.