you can use an old coffee jar to make starter bottles, basically, you put in some liquid (part of the must) I tend to deliberately keep some un dissolved sugar in the bottom, to prolong fermentation, basically u use a small amount to activate your wine, its very handy if your making a few batches, at the same time, to activate a starter bottle several days before making them, thus you can activate all of them from the one yeast sachet and also ensure an active yeast colony when needed.
If you drill a 10mm hole in the top of the lid a standard airlock tends to fit, well, in my case that's the bore of my airlocks I use, yours might be different.
You can also, keep a yeast strain going using a starter bottle, but, from what ive researched 3 generations is the maximum recommended usage because of divergeance of the yeast and possible contamination from wild yeasts (ie) three separate ferments and bottle topping up, for re use, is the maximum, then bin it.
If your using bread yeast its not worth the effort, unless you live in an area where its hard to obtain wine yeast, bread yeast in general produces a mediocre drink at best and cant be guaranteed to produce sufficient alcohol for preservation, its also worth using if you have a short supply of yeast, or, if you want to preserve a special yeast.
Basically bread yeast and wine yeast differ in that bread yeast is intended to start fermentation rapidly to make the bread rise, wine yeast doesn't necessarily rapidly ferment initially, but, is bred mainly to produce a nice alcoholic drink with no off flavours, which probably isn't an issue for bread yeasts, also, bread yeast may, or may not be capable of producing the required alcohol content for preservation, hence it might make you ill.
If you intend to make wine, your best bet is to use a dedicated wine yeast, not sure if a starter bottle would aid in bread making, but, it is possible I guess.
Having said that I have successfully used bread yeast in the past, although the end result isn't guaranteed.