Thanks.  I didn't notice that when I first looked.

I have received my order of bloody mary mix packets and when I get the tomato powder I'll have to experiment.  Each 59 ml seasoning packet (liquid) is for 1 quart of mix (0.95 liters) and I assume these will need to be made in a 1L water bottle.

The classic recipe for is 1.5 oz of vodka (29 ml) to 1/2 cup of tomato juice (118 ml).  6.8 of these will fit in a 1 liter bottle.  So I figure I should add about 200 ml of Vodka, the spice packet, the tomato powder, and then fill it up and shake it good.  That ought to get me pretty close to a standard strength bloody mary.  I'm just not sure how much tomato powder to add.

The down (or up) side to this is that if I do this on a solo trip I'll have to drink nearly 7 bloody marys to finish the bottle.