

Grams are a measure of weight (well, mass if you want to be really specific). Tablespoons are a measure of volume. In order to do a proper comparison you need to know density.
Because metric plans things nicely, a gram is one milliliter of water. 4 tbsp is 59.15ml. So… Yeah, pretty damn close to 60, but again that’s when working with water. I would imagine chili flakes are a little less dense and might throw that calculation off a bit.










Another thing to check, do you pre-warm the bottle? If not, it will absorb the heat of (ie, cool down) the coffee as soon as you pour it in. But if you get scalding hot water from your faucet or a kettle, pour it in, wait a minute, and dump it you will have a warm bottle that won’t feel the need to take as much heat from the coffee.