Use barista-blend almond milk for the cold foam; regular almond milk will not foam and will taste thin. Brew the chai double-strength because the ice dilutes it. The brewed chai concentrate keeps in a sealed jar in the fridge for up to 5 days, or freeze it in ice cube trays so the drink never waters down. If the foam sinks, it was over-frothed or the milk was too thin. Stop at 30 seconds next time. Make the pumpkin spice blend once a season and keep it in a jar.