Not trying to be a SA but, how far is civilization from you? You had to haul the bottles your using now so hauling glass would be a one time event.
If you fill to the brim and use a Saran wrop cover before screwing on the cap, you should not need to use Nitrogen. Kodak I believes makes their chemicals to use tap water but the quality of that can vary.
Do you have the problem with any other powder to mix formula's like D76 or ID11? You can also try running the Xtol thru a coffee filter prior to use. This may be a good idea for any product anyway.