Glass and stainless steel are the most common nonreactive materials. This includes glass, stainless steel, glazed ceramic, or enamel. A silicon based paper that can withstand high heat. It is especially nice to use with sugar and chocolate because they do not stick to the paper at all. Parchment paper can often be reused several times.
Liquids can vary from broths, to water, to syrups.
The broth is consumed first as a soup. A confection containing nuts and syrup. Made with young vegetables. In short, swelling. Yeast proofs when it swells and becomes bubbly.