You can get fancy with the math if you want, could check out any scientific osm calculator online. Lab nerds might google this as required. However, if memory serves, 5% dextrose (D5W) is very close to isotonic, and 0.9% saline is isotonic (isomolar to human plasma).
If you dissolve 5g of dextrose in water to 100 ml total volume, (~97ml water or so, since it dissolves) you will be roughly isotonic. Put this in Bottle A. If you dissolve 0.9g of salt in 100 mL, you should get near isotonic. Put this in bottle B. If you mix any percentage of A with any percentage of bottle B (ie to taste) you should remain isotonic. Maltodextrin 30g/100mL. Someone check my math.
Wether or not you would want to drink this is a different story.
Edit2: Oops!!! Maltodextrin error. Maltodextrin is 150g/500ml. https://fellrnr.com/...ience_of_Energy_Gels
300/L
30g/100mL in "bottle 3."
Edit 3: Maybe I shouldn't do these anymore. :) Sorry messed up the % amounts too. 9g/1000ml is 0.9%, so 0.9g in 100ml previously was off by a factor. Corrected above.
If you dissolve 5g of dextrose in water to 100 ml total volume, (~97ml water or so, since it dissolves) you will be roughly isotonic. Put this in Bottle A. If you dissolve 0.9g of salt in 100 mL, you should get near isotonic. Put this in bottle B. If you mix any percentage of A with any percentage of bottle B (ie to taste) you should remain isotonic. Maltodextrin 30g/100mL. Someone check my math.
Wether or not you would want to drink this is a different story.
Edit2: Oops!!! Maltodextrin error. Maltodextrin is 150g/500ml. https://fellrnr.com/...ience_of_Energy_Gels
300/L
30g/100mL in "bottle 3."
Edit 3: Maybe I shouldn't do these anymore. :) Sorry messed up the % amounts too. 9g/1000ml is 0.9%, so 0.9g in 100ml previously was off by a factor. Corrected above.