Carrying an open container of alcohol in a public space, such as public transport, is also an offense.
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You can enjoy beer, wine and liquor on board your bus as long as the service company allows it and there is no local ordinance prohibiting such. Consider how you're transporting the alcohol. Plastic cups and canned drinks are likely the best way to enjoy your drinks, as many companies prohibit kegs or glass bottles.
However, if you're 16 or 17 and accompanied by an adult, you can drink (but not buy) beer, wine or cider with a meal. If you're 16 or under, you may be able to go to a pub (or premises primarily used to sell alcohol) if you're accompanied by an adult.
You may eat and drink on the bus so that you feel completely at home and relaxed while you travel. However, please keep your fellow travelers in mind and follow a few guidelines: Avoid strong-smelling foods. Leave your seat like you would like to find it: no crumbs, leftover food or trash.
Most long distance trains have a restaurant café where you can buy snacks or a meal for your journey but if you do not feel for train food you can of course bring your own, even a bottle of wine if you want to really be in keeping with the French, as there are of course no rules against drinking wine and eating cheese ...
Tipping in Spain works differently: The customer actually has the option to not leave any tip at all. However, restaurants expect a 10% tip on each bill—although it's not a formal rule, and that percentage is much lower than tipping practices in other countries.