Firstly, sorry to be asking this again, I know I have seen some links to how to express manually on threads before, but for some reason, I can't find them now 
I was thinking of very occasionally expressing for my nearly 6 month old ds so that he can have some longer periods away from me, but I don't want to invest in a pump as this will not be a regular arrangement. I am totally clueless and don't know how to express or even how I am meant to keep the expressed milk and re-heat it, etc. so if you know of a beginners guide, it will be much appreciated.