This gets dangerously close to scrupulosity.
The Church is not unreasonable about Sunday work, least of all when it is necessary. On a personal note, while I am in a caregiving situation where schedules can change on a moment's notice, and I may be called upon 24/7 to tend to my father's corporeal needs, this said, I have recently begun to re-assess "what is necessary on Sunday and what isn't", especially regarding shopping. I do not do this as a scruple, but rather, to put things to rights in regard to "shopping creep" and "work creep" that is far too easy to let sneak up on oneself. My father's dietary supplements from Walmart are necessary, buying a Blu-Ray DVD player is not. (I held off on buying the Blu-Ray until after midnight on Sunday, when I then placed the order on the Best Buy website and picked it up on Monday.) Again, no scruple here, just resistance against letting Sunday gradually become "just another day", and against "feeding the beast" of a secular, apostate economy and social system that only remains profitable on Sundays if we let it happen.
I have attached what Jone has to say about it in Moral Theology. He is actually on the strict side --- I know he was writing in the 1920s, and my edition has a 1961 imprimatur, but his observations, for instance, about operating an automatic washing machine are a bit antiquated, with power dryers having become commonplace, hanging clothes out to dry is now a quaint throwback, at least in Anglophone (and Francophone) North America, and merely dumping clothes into the washer, adding detergent, and pressing a button, to object to those things, taken all by themselves, would be almost тαℓмυdic. I would say, in all cases, use common sense informed by a sensus catholicus. If I am going to Walmart to get my father a box of generic Ensure equivalent, then get there and remember that we're low on orange juice and eggs, I'm not going to get a scruple and say "I have to wait till tomorrow to come back and get those other things". Again, common sense. If in doubt, consult a traditional confessor.