CG's recommended dilution for Honeydew is a bit difficult to ferret. On their site, they say 1:4000, but then go on to say one oz for four to five gallons of water, which works out as 1:512 or 1:640. Other sites say one capful for five gallons, which is supposed to result in a ratio of 1:1100.
Ok. Let's go with the 1:1100, which is the commonly quoted number. We want to mix the solution in the container so that the dilution when it hits your paint is this ratio.
Gilmour foam gun settings have the following dilutions:
A:1 oz / gallon = 1:128
B:2 oz / gallon = 2:128
C:4 oz / gallon = 4:128
D:6 oz / gallon = 6:128
E:12 oz / gallon = 12:128
Using some algebra, for the A setting:
1/128 x 1/x = 1/1100 => x = 8.593, which means mixing 1 oz Honeydew with 8.593 oz of water. In a 32 oz container, that means 3.34 oz Honeydew and 28.66 oz water, for a total of 32 oz diluted solution. The same logic will give you the dilutions for all of the settings:
A: mix 3.34 oz Honeydew and 28.66 oz water for 32 oz pre-mixed solution
B: mix 1.76 oz Honeydew and 30.24 oz water for 32 oz pre-mixed solution
C: mix 0.90 oz Honeydew and 31.10 oz water for 32 oz pre-mixed solution
D: mix 0.61 oz Honeydew and 31.39 oz water for 32 oz pre-mixed solution
E: mix 0.31 oz Honeydew and 31.69 oz water for 32 oz pre-mixed solution
This, of course, is with the assumption that the desired dilution for foaming (I've seen one manufacturer refer to as panel impact ratio) is the same as the dilution for a bucket wash, which may or may not be the case (none of the sites I visited seem to say anything definitive on this point).