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Can you use cow milk?
I'm assuming your child is older than 12 months? Formula is not needed after 12 months so my advice is to use this trip as an opportunity to phase out formula/bottles and offer cow's milk from a cup (but no more than a cup or 500ml over 24hrs). After 12 months, a toddler should get almost all calories from food and hydration from water. Formula like the one pictured are not needed and can lead to problems with toddlers filling up on formula and having insufficient appetite for solids. https://raisingchildren.net.au/newborns/breastfeeding-bottle-feeding/bottle-feeding/infant-formula#toddler-formulas-nav-title
I’ve done a quick google and it seems you can get Nan Pro in Walmart, if you’re not wanting to or able to switch to cow’s milk. Otherwise I’d probably try Similac formula x
Nestle is an international company. You could try and send them an email and ask if there’s an equivalent in the US?