If you don't want to go to the whole expense of buying preserving jars etc, you can just recycle any jars you have at home with lids on them and use those - boil them to sterilise and then you just pop the original lid straight back on when you pour in the hot preserve and it will reseal itself and suck the top back down. Or you can just seal with with wax poured over the top of the preserve and then plastic over the top - my nan only ever does it that was and she has the best preserves for miles! I have posted a huge thread on here about preserving somewhere, I will have to find it.