So you're basically using an antibiotic that stays active for days... bad idea in my view, even if it doesn't contain alluminum.
Healthy alternative:
Step 1: when you make lemon juice, save the rind and the pulp, and leave it out to dry in the sun for at least 30 days (ideally on a wood, ceramic, glass or other nontoxic flat surface). Remember to protect it from rain, as that can ruin it. If it's rainy season, you can help speed up the drying process by using a fan, as otherwise it'll grow mold and fruit flies. If possible, use organic lemons, and wash with warm water before use just in case there are some pesticides in it (many organic farms still use pesticides). If they're not organic, you could use a raw vinegar and water solution to help remove the pesticides up front. Or just deal with the pesticides, but they might make it itch. It'd still be much better than any industrial product though.
Step 2: Grind it down to a powder. I use a regular coffee/spice grinder, it takes some time but does work. I prefer to grind smaller amounts at a time as it keeps the lemony aroma more fresh, but it'll work even if you grind it all at the same time.
Step 3: Apply some fresh lemon juice (doesn't need to be organic, but always better if it is) to your armpits, then apply some of the dry lemony dust. It'll stick to the lemon juice. If you apply too much it'll turn into a paste which will then fall off in chunks over the course of the day, which can be weird for other people, but they won't smell.
In my experience this will resist heavy exercise and sweating even in a moist and hot environment. I haven't tried it on feet but I'm sure it'd work.
If you want even more protection and a different perfume, mix the fresh lemon juice with some ginger root juice.
