The problem with the "cut all the things" attitude is that there's a lot of government spending that is actually a net positive for the country. Some are obvious, things like infrastructure spending. Same with (most) education spending. Every dollar we spend in those things serves to strengthen our country, and can even pay us back.
Similar points can be made about other services. Poison Control Centers substantially reduce costs at emergency rooms. Homeless services and drug rehab facilities/programs and reduce costs with crime.
So there is a good argument for a fiscal conservative to support many types of government spending. The funny thing is lots of so-called "conservatives" (read: social conservatives and tea party hacks) don't actually think this way.
Anyways, to the issue at hand. Meals on Wheels, regardless of how noble an endeavor it is, doesn't fit this criteria imho. The elderly and infirm have pretty much zero potential to return to being economically valuable to society in any way, and these elderly, by their very nature of having to rely on a service to feed them, probably don't even have family that would gain a tangential benefit from seeing them taken care of.
In fact, if we're being ruthlessly utilitarian, which I would argue is the baseline of fiscal conservatism, I would argue that keeping these people alive only serves to bring further harm to our finances. The sooner they die the sooner we can remove them from the Medicare/Medicaid rolls.
So from a brutally fiscally conservative viewpoint I would say Meals on Wheels is absolutely a program that should be cut.
However when you consider that our presidents extravagant vacationing and maintenance of his family at Trump Tower has already wasted more money than was even being supplied to meals on Wheels in the first place then I would further articulate this entire argument as a steaming pile of horseshit from cruel idiots who have no idea how to manage money and very little concept of humanity.