I would try a herbal tea blend of antimicrobial plants of the Lamiaceae family - specifically:
Lavandula angustifolia, formerly L. officinalis, is a flowering plant in the family Lamiaceae, native to the Mediterranean (Spain, France, Italy,
Croatia etc.). Its common names include lavender, true lavender and English lavender (though not native to England); also garden lavender, common
lavender and narrow-leaved lavender.
Peppermint (Mentha × piperita) is a hybrid species of mint, a cross between watermint and spearmint. Indigenous to Europe and the Middle East, the
plant is now widely spread and cultivated in many regions of the world. It is occasionally found in the wild with its parent species.
Widely cultivated for its mouthwatering fragrance, Origanum majorana (Sweet Marjoram) is a bushy sub-shrub forming a mound of highly aromatic, ovate,
gray-green leaves.
Salvia officinalis, the common sage or just sage, is a perennial, evergreen subshrub, with woody stems, grayish leaves, and blue to purplish
flowers.
Thymus vulgaris (common thyme, German thyme, garden thyme or just thyme) is a species of flowering plant in the mint family Lamiaceae, native to
southern Europe from the western Mediterranean to southern Italy.
pubmed.ncbi.nlm.nih.gov...
However, as to ratio of herbs, the abstract in the source mentions that Thymus vulgaris had the strong inhibitory and bactericidal effect against
multidrug-resistant Staphylococcus aureus.
You could just start off with Thyme tea and see if that helps. But adding mostly Thyme and a little of the others won't hurt, and just may do the
trick, as well you can add these culinary herbs to your meals too. Try experimenting with ratios and good luck.