extension.psu.edu/canning-with-less-sugarSays to add sweetener after opening canned items. I am not fond of this option.
Canning and Preserving with Love (a group on facebook) has many good posts about using artificial sweeteners.
erythritol
Pro-less carbs, less calories
Con-uses less volume than sugar so recipes will be reduced in volume
Con-has only one note of sweetness flavor (recommended to use Sucrolose "splenda" instead)
Con-sometimes does not thicken or jel
Use the low and no-sugar pectin, not regular pectin, if you go with erythritol.
I like the idea of using erythritol in canning fruit. I also would only use a smaller portion and not 1:1 substituting for sugar.
Conversion Chart for Splenda Brand Sweeteners to Sugar:
Splenda No Calorie Sweetener Packets
2tsp sugar = 1 packet
1tbsp sugar = 1 1/2 packets
1/8 cup sugar = 3 packets
1/4 cup sugar = 6 packets
1/3 cup sugar = 8 packets
1/2 cup sugar = 12 packets
2/3 cup sugar = 16 packets
3/4 cup sugar = 18 packets
1 cup of sugar = 24 packets
Splenda No Calorie Sweetener Granular
1tsp = 1tsp
1tbsp = 1tbsp
1/4 cup = 1/4 cup
1/2 cup = 1/2 cup
3/4 cup = 3/4 cup
1 cup sugar = 1 cup
Splenda Sugar Blend for Baking
1tsp = 1/2tsp
1/4 cup = 1/8 cup or 6tsp
1/3 cup = 8tsp
1/2 cup = 1/4 cup
2/3 cup = 1/3 cup
3/4 cup = 6tbsp
1 cup = 1/2 cup
Splenda Brown Sugar Blend for Baking
1tsp = 1/2tsp
1/4cup = 1/8 cup or 6tsp
1/3 cup = 8tsp
1/2 cup = 1/4 cup
2/3 cup = 1/3 cup
3/4 cup = 6tbsp
1 cup = 1/2 cup
If I make jams or can fruit, I'll be making no sugar or very low sugar, so this is one option I keep in mind.