Watering my plants while I'm away

Tomorrow we (me and A.) are going on our first vacation together. We both are really excited and I hope we and especially she will see a lot of nice spots in germany, something that she wanted to do since she came here.

I found this easy method (Pflanzen mit PET-Flaschen bewässern: So geht’s - Mein schöner Garten) where you use a thin PET bottle with and poke some holes into the lid. Then push the bottle upside down into the soil.

The water should initially stay in the bottle but later on get sucked out though osmosis. Let’s hope it works!