I have a gigabyte of backup data for stuff like that; it costs $30 but you can use it up as slowly as you want (once you deplete your 250MB).

I find it super annoying that low bandwidth information (i.e. a paragraph or two of text) has been replaced by ad-riddled Youtube videos! I've been able to avoid this usage pattern while on mobile data, but I can see that not everyone feels they can.

Wikipedia is lightweight, no problem on frugal data.