Just working on the bit of the mod related to quests. So for removing the filters from the T1 quest reward pool, I think this is the correct code?
Relevant vanilla section:
<quest id="quest_tier1complete"> [quest property stuff] <reward type="Item" id="resourceWaterFilter" ischosen="true" isfixed="true" value="2"/>
Correct xpath to remove that?
<remove xpath="//quest[@id='quest_tier1complete']/reward/type[@item='resourceWaterFilter']"/>
If that's correct, I can probably append something like the original line that to the T3 quest options, or else go with one of the options BFT suggested to offer a graded chance from T3 on up. Can't seem to figure out what the 'value' refers to as I don't think it's actually quantity, but the plaintext description in the vanilla quest.xml file is kinda unclear to me.
Once this is done, I can toss the mod up for playtesting!