Add water storage tank to RO unit:

AR122 and RD102 are pure aquarium unit in that there is DI filter which reduces the particles in the water to 0 ppm. It is not recommended for human consumption because it leaves a funky taste in water. It is not harmful however. Regarding your application, we have consulted with our technician. You need a modified unit (changing AR122 or RD102 to a drinking unit, no DI filter), then add a 4G tank to go with the custom unit.

We do sell a conversion kit for this setup. https://filterdirect.com/conversion-convert-aquarium-drinking-water-system-p-370.html