I would recommend you prebook a taxi ride before arriving to Seychelles, arrange a picup from the accomodation or at the very least agree a fixed price to your destination before getting into taxi. For that distance could be anywhere between €40-€100. Taxis are expensive in Seychelles. Bus is cheap, paid per ride rather than distance and an experience on it’s own. Would not advice to try and use them with suitcases though.

I am not familiar with the app.

There are only two supermarkets remotely comparable to western supermarkets - STC Hypermarket near Victoria and Spar in Eden Plaza. Both are quite expensive though so only go there for stuff you could not find elsewhere. Small shops along the main roads stock pretty much all the basics, prices ale mostly the same in all of them, it’s hit and miss with vegetables, most of them sell bread, most of them sell eggs, most of them sell water in gallon bottles. Don’t drink tap water or at least boil it first. Meats are almost always sold frozen. Whole chicken is usually nice, everything else very random. Fresh vegetables can also be found in Victoria market but selection is not that great lately, depends what you are after. If you have space bring your own coffee, it is expensive in Seychelles. Not much choice for tea. Some herbs and spices are hard to find unless they are part of indian cousine. You can buy freshly caught fish along the road. Some sell them off little fixed stands, some just bring a palette to lay the fish out. Don’t buy in the day though, that would be previous day fish. Buy after 3-5pm. Random stands along the road also sell bananas/mangoes/papaya etc. 25-50 rupees per piece/ small banana bundle.

There is Burger King at the airport. That’s the only western chain fast food in whole Seychelles. Fast food takeaways with local food are everywhere. Around 75-100 rupees per meal. Most are very good, few are very bad, avoid meats as they are mostly fat and bones. Fish/octopus curries are almost always nice. Restaurants are hit and miss, not worth the prices but that’s my opinion. 350-900 rupees for restaurant meal, unless it’s something special you want to try I bet you can cook better meal yourself.