Scaled down batch of soda syphon batter
Generally with a 1L siphon it’s advised to use 2 or 3 charges. If you scale down your ingredients, you’ll create a much larger gap in the canister, this would mean you’d have to use even more charges which is not really safe at all!

If you’d like to scale down your recipe, you should also scale down your canister size too. Try using 0.25 or 0.5 liter canisters I’d say.