First of all thanks for your feedback. I actually heard it a couple times by now that people use the Energy Powder and the Fresh Water quite often, so keeping these could be considered as well. I dont really mind keeping Energy Powder over Fresh Water though since it heals 20 HP more.
Also the cost of entering an Excavation Site is already 2.5k. Not sure when it was changed though but has to be quite a while back since I cant remember it being 5k anymore.