Am a huge fan of HN's....I buy them elsewhere, but......
With aquarium heater inside, insulation outside and underneath during winter.
https://www.backyardchickens.com/articles/aarts-heated-waterer-with-horizontal-nipples.67256/
Crate and brooder waterers.
https://www.backyardchickens.com/ar...nipple-waterer-for-wire-crates-by-aart.72704/
Portable quart waterer.
https://www.backyardchickens.com/articles/2-nipple-quart-water-bottle-holder.67773/
With aquarium heater inside, insulation outside and underneath during winter.
https://www.backyardchickens.com/articles/aarts-heated-waterer-with-horizontal-nipples.67256/
Crate and brooder waterers.
https://www.backyardchickens.com/ar...nipple-waterer-for-wire-crates-by-aart.72704/
Portable quart waterer.
https://www.backyardchickens.com/articles/2-nipple-quart-water-bottle-holder.67773/