We have to go on vacation. Has anyone tried these?

http://www.gardeners.com/Precision-D...ing.35-140.cpd

My mother-in-law will be checking in on the house while we're gone (1
week). Would these work well. I'm thinking it might be easier to
fill the bottle instead of standing there watering the garden.

We have a very small garden - 4 tomatos, 2 peppers.

It looks like I would need 1 for each individual plant.