HC-110 dil H is a one-shot only developer, unless you are able to find some HC-110 replenisher, and follow the replenishment procedure.
Stop bath can be re-used until the indicator changes colour, except that you will find that it will need filtering and will tend to promote mould growth if you leave it for awhile. So re-use makes sense if you are going to develop multiple batches of film over a short time (3-4 days) but longer term storage isn't a good idea. One tip to increase economy: if you use stop bath one-shot, mix and use it at half strength.
Ilford Rapid Fix can be re-used until: a) it loses chemical capacity; and b) it becomes saturated with silver. Use a "clip test" to estimate remaining capacity - measure the clearing time when first mixed and then check it regularly. When the clearing time is twice the initial clearing time, it is time to replace the fixer. I also pay heed to Ilford's capacity figures, which appears to be 24 rolls per litre of working strength fixer, as can be found on the data sheet:
http://www.ilfordphoto.com/Webfiles/2011427111531653.pdf.
You may need to filter the fixer from time to time, and you need to devote the working strength fixer to film use only - don't use it for paper as well.
Working strength wetting agent will grow mould quickly. Use your wetting agent one-shot only, except if you are processing multiple batches of film in a single day, when you can re-use it during that day.
The HC-110, stop bath and wetting agent tend to be very economical, so it makes sense to use them one-shot.
Hope this helps.
EDIT: HC-110 dilution B is 1+31. Unofficial HC-110 dilution H is 1+63.