Bottled drinks bought when out. We always had to take water from home. If we did need to buy a drink it was a big drama and we all had to share which was horrible.
We almost always get one each now EVERY time we go out and I am always astonished and feel so excited and pleased like it is a big treat 
I erm still think taxis are probably for gazillionaires
I should probably look into that. Public transport v good where we are though so not much need really.
We also had the rule of 1 loo paper square for a wee, two for a poo. Folded neatly into quarters. I can't remember how old I was when I realised that this was madness and just to use as much as I wanted. Probably when I started my periods TBH.
Shower gel as well was rationed into tiny 5p sized amounts for each body part
and baths were weekly - we didn't have a shower 
We make DS shower daily now but I still have issues showering often enough because I think it's a "waste" :( I'm also secretly disgusted and horrified by how much shower gel and bubble bath DH goes through even though I admit that he smells cleaner than I do.
We were allowed McDonalds (not v often though) but I remember being utterly floored when one of my first boyfriends ordered two burgers at once. I found this impossibly dangerous behaviour and refused to partake until one day I agreed to have chicken nuggets instead of chips and the decline started.
Shoes we also had one pair each - I find it very strange that DS is expected to have more than one pair, even more than one for the same purpose. It seems even more important in Germany, he went away for a week and was instructed to take five different pairs of shoes - he could almost have worn a new one every day! I had school shoes, weekend trainers, then the old/scruffy trainers would be regaled to school PE shoes and in the summer I might have sandals. And wellies. DS has about three pairs of normal shoes, sports shoes, indoor shoes, sandals, and I'm expected to buy him proper winter boots as well any time now.
Funnily enough though I am more frugal about cereal and squash than my DM was. We always had about six different kinds of cereal open at once yet I only let DS have one open at a time and this must be finished before a new packet is opened. This is because he ranks them in order of preference and will let one go stale at the expense of the other, preferred one, and never rolls the plastic bit down properly.