You likely are going to need a decent filter and a portable water softener. Texas and other points southwest have some very hard water with tons of minerals in it. We use the one shown below when in the valley. water softener
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If the odor you mention is that of sulfur then you probably have some sulfated water from some source. the cure is to completely sanitize your water system then flush with plenty of potable water then perhaps give it a vinegar or baking soda treatment (similar to what you do with a coffee pot). filters or softeners will do little to help with sulfated water.
Good luck / Skip
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So far the advise has been good, in addition to the possibility of sulfur in the water, it is possible to get anaerobic bacteria in the water-heater. When a water-heater has been left sitting for some time, the regular bacteria use up all the oxygen, and the the anaerobic take over and go to town.
The deposits are just because you have been using really hard water.
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