Cape Fear Press   Dragon & Phoeniz Photogravure Tissue, Ferric Chloride as well as supplies for other photo based printmaking processes.

Cheap Multi Color LED Safelight  / Task Lamps.   There now many dimmable outdoor led multicolor flood lights that simply plug in and can be used as color tuned and dimmable safelights for your process.  An added bonus is that changing the color of the light can increase the contrast of your materials for easy viewing and problem solving.  ie change the color to blue and gravure tissue almost disappears.  Change it to red and you will see thing you can not with white light.  They are easy to find.

Water Filtration   I have not purchased or used distilled water for photogravure for over fifteen years.  I thought about the environmental impact of the plastic and haulage involved with bottled water and purchased a Pur 3 Stage Water Filter.  I have not purchased a single gallon of distilled water for photogravure since.  A simple water filter might not be the perfect match for your water.  For most it will likely be more than adequate.

Chemical Filtration

Filter Socks    Filter alcohol or dichromate as fast as you can pour it.  https://www.amazon.com/gp/product/B004F9GXG2/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Vintage Darkroom Thermometers   http://www.slate.com/articles/health_and_science/elements/features/2010/blogging_the_periodic_table/the_sort_of_sad_death_of_the_mercury_thermometer.html