I know there are a lot of herpers out your way and was wondering if anyone I "knew" was affected.
You can't shower, but a pack of baby wipes will keep you clean for a few days. Hand sanitizer only in the bathrooms...
Considering that the officials are still giving a lot of "I don't know" responses to questions I'd be taking my own steps to get water. Not that I don't trust my government, but... well, that's another thread.
Save the five gallons from FEMA for your own drinking. Put out pots, pans, etc. to catch the rain we're getting tomorrow - got a rain barrel? You can run the rainwater through a camp filter and then boil it (I would do both because I'm just super-cautious), and it should be fine for the herps.
Is there anyone on a well in your area? If just the river got hit the wells outside the immediate vicinity should be unaffected. Tributaries and any upstream sources should be ok as well. Again, you'd have to filter the water yourself.
As for the ROID, have you called the manufacturer about whether it will filter out that chemical?